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Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE PDF Download

Q.291. Calculate the kinetic energies of protons whose momenta are 0.10, 1.0, and 10 GeVic, where c is the velocity of light. 

Ans. The formula is

Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE

Thus         T = 5.3 MeV for      Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE

T = 0.433 GeV forIrodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE

T = 9.106 GeV for   Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE

Here we have used mo c2 = 0.938 GeV 

 

Q.292. Find the mean path travelled by pions whose kinetic energy exceeds their rest energy η = 1.2 times. The mean lifetime of very slow pions is ζo = 25.5 ns. 

Ans. Energy of pions is (1 + η) mo c2 so

Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE

Hence  Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE   or  Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE

Here  Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE of pion. Hence time dilation factor is 1 + η and the distance traversed by the pion in its lifetime will be

Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEEIrodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE15.0 metres

on substituting the values of various quantities. (Note. The factor  Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE  can be looked at as a time dilation effect in the laboratory frame or as length contraction factor brought to the other side in the proper frame of the pion).

 

Q.293. Negative pions with kinetic energy T = 100 MeV travel an average distance l = 11 m from their origin to decay. Find the proper lifetime of these pions. 

Ans. From the previous problem

Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE

where  Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE  is the rest mass of pions.

substitution gives Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE

Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE

where we have used  Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE

 

Q.294. There is a narrow beam of negative pions with kinetic energy T equal to the rest energy of these particles. Find the ratio of fluxes at the sections of the beam separated by a distance l = = 20 m. The proper mean lifetime of these pions is ζo= 25.5 ns. 

Ans. here Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEEso the life time of the pion in the laboratory frame is

Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE

The law of radioactive decay implies that the flux decrease by the factor.

Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE

Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE

 

Q.295. A stationary positive pion disintegrated into a muon and a neutrino. Find the kinetic energy of the muon and the energy of the neutrino.

Ans. Energy-momentum conservation implies

Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE

Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE

But     Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE

Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE

Hence Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE

So  Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEEIrodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE

Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE

Substituting  Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE

Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE

Also  Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE

 

Q.296. Find the kinetic energy of a neutron emerging as a result of the decay of a stationary ∑ - hyperon (∑ - →n + π-). 

Ans. We have

Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE       (1)

Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE

or Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE

or Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE

because (1) implies      Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE

Hence  Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE

and    Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEEIrodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE

Substitution gives T= 19.55 MeV 

 

Q.297. A stationary positive muon disintegrated into a positron and two neutrinos. Find the greatest possible kinetic energy of the positron. 

Ans.  The reaction is

Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE

 The neutrinoes are massless. The positron will carry largest momentum if both neutrionesIrodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE move in the same direction in the rest frame of the nuon. Then the final product is effectively a two body system and we get from problem (295)

Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE

Substitution gives  Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE

 

Q.298. A stationary neutral particle disintegrated into a proton with kinetic energy T = 5.3 MeV and a negative pion. Find the mass of that particle. What is its name? 

Ans. By conservation of energy-momentum

Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE

Then Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE

Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE

This is a quadratic equation in M Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE

or using Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE and solving 

Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE

Hence, Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE

taking the positive sign. Thus

Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE

Substitution gives

Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE

From the table of masses we identify the particle as a ∧ particle

 

Q.299. A negative pion with kinetic energy T = 50 MeV disintegrated during its flight into a muon and a neutrino. Find the energy of the neutrino outgoing at right angles to the pion's motion direction.

Ans. See the diagram. By conservation of eneigy

Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE

Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE

or

Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE

orIrodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE

Hence the eneigy of the neutrino is

Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE

on writing Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE

Substitution gives Ev = 21.93 MeV

 

Q.300. A ∑+ hyperon with kinetic energy T∑ = 320 MeV disintegrated during its flight into a neutral particle and a positive pion outgoing with kinetic energy Tπ = 42 MeV at right angles to the hyperon's motion direction. Find the rest mass of the neutral particle (in MeV units). 

Ans. By eneigy conservation

Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE

Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE

or Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE

or Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEEIrodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE

Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE

or using the K.E. of ∑ & π

Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE

andIrodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE

 

Q.301. A neutral pion disintegrated during its flight into two gamma quanta with equal energies. The angle of divergence of gamma quanta is Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEEFind the kinetic energy of the pion and of each gamma quantum.

Ans. Here by conservation of momentum

Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE

Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE

Thus Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE

Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE

or  Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE

and  Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE

substitution gives  Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE

 Also

Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE

= mx c2 in this case (θ = 60°)

 

Q.302. A relativistic particle with rest mass m collides with a stationary particle of mass M and activates a reaction leading to formation of new particles: m + M →m1 +m2 . ..,where the rest masses of newly formed particles are written on the right-hand side. Making use of the invariance of the quantity E2  — p2c2 , demonstrate that the threshold kinetic energy of the particle m required for this reaction is defined by Eq. (6.7c). 

Ans. With particle masses standing for the names of the particles, the reaction is

Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE

On R.H.S. let the energy momenta beIrodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEEetc. On the left the energy momentum o f the particle m is Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE and that of the other particle is Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEEwhere, of course, the usual relations

Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE

hold. From the conservation of energy momentum we see that

Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE

Left hand side is

Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE

We evaluate the R.H.S. in the frame where  Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE (CM frame of the decay product).

Then          Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE

because all energies are +ve. Therefore we have the result

Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE

or  since E = mc2 + T, we see that  T ≤ Tth where

 Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE

 

Q.303. A positron with kinetic energy T = 750 keV strikes a stationary free electron. As a result of annihilation, two gamma quanta with equal energies appear. Find the angle of divergence between them.

Ans. By momentum conservation

Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE

or  Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE

Substitution gives

θ = 98.8°

 

Q.304. Find the threshold energy of gamma quantum required to form (a) an electron-positron pair in the field of a stationary electron; (b) a pair of pions of opposite signs in the field of a stationary proton.

Ans. The formula of problem 3.02 gives

Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE

when the projectile is a photon 

(a) For Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE

Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE

(b) ForIrodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE

Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEEIrodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEEIrodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE

 

Q.305. Protons with kinetic energy T strike a stationary hydrogen target. Find the threshold values of T for the following reactions: (a) Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE (b) Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE

Ans. (a) For Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE

Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE

(b) For Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE

Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE

Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE

 

Q.306. A hydrogen target is bombarded by pions. Calculate the threshold values of kinetic energies of these pions making possible the following reactions:   (a)Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE  (b) Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE

Ans. (a) Here

Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE

Substitution gives Tth = 0.904 GeV 

Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE

Substitution gives Tth = 0.77 GeV. 

 

Q.307. Find the strangeness S and the hypercharge Y of a neutral elementary particle whose isotopic spin projection is Tz = +1/2 and baryon charge B = +1. What particle is this? 

 Ans. From the Gell-Mann Nishijima formula

Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE

we get 

Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE

Also Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE. Thus the particle is =° 0.

 

Q.308. Which of the following processes are forbidden by the law of conservation of lepton charge: 

Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE   Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE

Ans. (1) The process Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE  cannot occur as there are 2 more leptons Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE on the right comopared to zero on the left

(2 ) The process Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE is forbidden because this corresponds to a change of lepton number by, (0 on the left - 1 on the right)

(3) The process Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE is forbidden because Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE being both leptons ΔL = 2hre.

(4) , (5), (6) are allowed (except that one must distinguish between muon neutrinoes and electron neutrinoes). The correct names would be

Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE

 

Q.309. Which of the following processes are forbidden by the law of conservation of strangeness: 

Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE      Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE

Ans. (1)Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE

SO Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE

(2)   Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE

SOIrodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE

(3)   Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE

SO Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE

(4)  Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE 

SOIrodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE

(5)  Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE

SOIrodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE

(6)   Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE

SOIrodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE

 

Q.310. Indicate the reasons why the following processes are forbidden: 

Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE     Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE

Ans. (1) Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE

is forbidden by energy conservation. The mass difference

Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE

(The process 1 → 2 + 3 will be allowed only if m1 > m+ m3.)

(2) Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE

is disallowed by conservation of baryon number.

(3) Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE

is forbidden by conservation of charge

(4)Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE

is forbidden by strangeness conservation.

(5)Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE

is forbidden by conservation of muon number (or lepton number).

(6)Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE

 is forbidden by the separate conservation of muon number as well as lepton number.

The document Irodov Solutions: Elementary Particles- 1 | I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE is a part of the JEE Course I. E. Irodov Solutions for Physics Class 11 & Class 12.
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FAQs on Irodov Solutions: Elementary Particles- 1 - I. E. Irodov Solutions for Physics Class 11 & Class 12 - JEE

1. What are elementary particles?
Ans. Elementary particles are the fundamental building blocks of matter. They are indivisible and do not have any internal structure. These particles are the smallest known entities and cannot be broken down into smaller components.
2. How many types of elementary particles are there?
Ans. There are four known types of elementary particles: quarks, leptons, gauge bosons, and the Higgs boson. Quarks and leptons are the building blocks of matter, while gauge bosons are responsible for mediating the fundamental forces of nature. The Higgs boson is associated with the Higgs field, which gives particles their mass.
3. What is the significance of elementary particles in physics?
Ans. Elementary particles play a crucial role in understanding the fundamental laws of physics. They help explain the behavior of matter and the interactions between particles. By studying elementary particles, scientists aim to unravel the mysteries of the universe and discover the underlying principles that govern its existence.
4. Can elementary particles be created or destroyed?
Ans. According to the conservation laws in physics, elementary particles cannot be created or destroyed. They can only change their form or interact with other particles. This principle is known as the conservation of particle number. However, particles can be converted into different types through processes such as particle decay or particle-antiparticle annihilation.
5. How are elementary particles classified?
Ans. Elementary particles are classified based on their properties, such as their mass, charge, and spin. They are organized into different generations or families, with each generation having particles that are similar in nature but differ in mass. For example, the electron, which is a lepton, belongs to the first generation, while the heavier muon and tau particles belong to the second and third generations, respectively.
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