Test: Physics - 6

A proton and an electron are acceleration by the same potential difference Let λ _e and   λ _p denote the de Broglie wavelengths of the electron and the proton respectively

Ionization energy of a hydrogen-like ion A is greater than that of another hydrogen-like ion B. Let r,u,E and L represent the radius of the orbit,speed of the electron, energy of the atom and orbital angular momentum of the electron respectively. In ground state

When an impurity is doped into an intrinsic semiconductor,the cunductivity of the semiconductor

Two identical p-n junction may be connected in series with a battery in three ways (figure). The potential difference across the two p-n junctions are equal is: 

The mass number of a nucleus is

Two protons are kept at a separation of 10 nm. Let F_n and  F _e be the nuclear force and the electromagnetic force between them.

Ten grams of ⁵⁷Co kept in an open containg beta-decays with a half-life of 270 days. The weight of the material inside the container after 540 days will be very nearly

If elements with principle quantum number n>4 were not allowed in nature, the number of possible elements would be

Consider the spectral line resulting from the transition n = 2  → n = 1 in the atoms and ions given below. The shortest wave length is produced by

The equation

Consider α particles, β particles and γ - rays each having an energy of 0.5 MeV. In increasing order of penetrating powers, the radiations are

The K_∝ X-ray emission line of tungsten occurs at λ  =0.021 nm. The energy difference between K and L levels in this atom is about

A particle of mass M at rest decays into two particles of masses m1 and m2, having nonzero velocities. The ratio of the de Broglie wavelength of the particles λ ₁ / λ ₂ is

Binding energy per nucleon vs. mass number curve for nuclei is shown in the figure W,X,Y and Z are four nuclei indicated on the curve. The process that would release energy is

The transition from the state n = 4 to n =3 in a hydrogen-like atom results in ultraviolet radiation. Infrared radiation will be obtained in the transition

A Hydrogen atom and a Li ⁺⁺ ion are in the second excited state. If l_H and  l _Li are their respectively electronic angular momenta, and E_H and E _Li their respectively enrgies, then

In a photoelectric experiment anode potenial is plotted against plate current

If a star can convert all the He nuclei completely into oxygen nuclei. The energy released per oxygen nuclei is [Mass of He nucleus is 4.0026 amu and mass of Oxygen nucleus is 15.9994]

Direction : Read the following question and choose
A. If both assertion and reason are true and reason is the correct explantion of assertion
B. If both assertion and reason are true but reason is not the correct explanation of assertion
C. If assertion is true but reason is false
D. If assertion is false but reason is true
Assertion : Nuclear density is almost same for all nuclei
Reason: Size of nucleus  ∞ A ^1/3