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31 Year NEET Previous Year Questions: Dual Nature of Radiation & Matter - 1 - Question 1

Which one of the following statements is nottrue for cathode rays? [2002]

Detailed Solution for 31 Year NEET Previous Year Questions: Dual Nature of Radiation & Matter - 1 - Question 1

31 Year NEET Previous Year Questions: Dual Nature of Radiation & Matter - 1 - Question 2

When ultraviolet radiation is incident on asurface, no photoelectrons are emitted. If asecond beam causes photoelectrons to beejected, it may consists of [2002]

Detailed Solution for 31 Year NEET Previous Year Questions: Dual Nature of Radiation & Matter - 1 - Question 2

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31 Year NEET Previous Year Questions: Dual Nature of Radiation & Matter - 1 - Question 3

A photoelectric cell is illuminated by a pointsource of light 1m away. When the source isshifted to 2m then [2003]

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31 Year NEET Previous Year Questions: Dual Nature of Radiation & Matter - 1 - Question 4

According to Einstein’s photoelectric equation, the graph between the kinetic energy of photoelectrons ejected and the frequency of

incident radiation is [2004]

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31 Year NEET Previous Year Questions: Dual Nature of Radiation & Matter - 1 - Question 5

A photosensitive metallic surface has workfunction, hv_{0}. If photons of energy 2 hv_{0} fallon this surface, the electrons come out with amaximum velocity of 4 ×10^{6} m/s. When thephoton energy is increased to 5 hv_{0}, thenmaximum velocity of photoelectrons will be

[2005]

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31 Year NEET Previous Year Questions: Dual Nature of Radiation & Matter - 1 - Question 6

The work functions for metals A, B and C arerespectively 1.92 eV, 2.0 eV and 5 eV.According to Einstein s equation, the metalswhich will emit photoelectrons for a radiationof wavelength 4100 Å is/are [2005]

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31 Year NEET Previous Year Questions: Dual Nature of Radiation & Matter - 1 - Question 7

When photons of energy hv fall on an aluminiumplate (of work function E_{0}), photoelectrons ofmaximum kinetic energy K are ejected. If thefrequency of the radiation is doubled, themaximum kinetic energy of the ejectedphotoelectrons will be [2006]

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31 Year NEET Previous Year Questions: Dual Nature of Radiation & Matter - 1 - Question 8

In a discharge tube ionization of enclosed gas isproduced due to collisions between [2006]

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31 Year NEET Previous Year Questions: Dual Nature of Radiation & Matter - 1 - Question 9

A photo-cell employs photoelectric effect toconvert [2006]

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31 Year NEET Previous Year Questions: Dual Nature of Radiation & Matter - 1 - Question 10

The momentum of a photon of energy 1 MeV inkg m/s, will be [2006]

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31 Year NEET Previous Year Questions: Dual Nature of Radiation & Matter - 1 - Question 11

Monochromatic light of frequency 6.0 × 10^{14} Hzis produced by a laser. The power emitted is 2 × 10^{–3} ω. The number of photons emitted, onthe average, by the sources per second is [2007]

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31 Year NEET Previous Year Questions: Dual Nature of Radiation & Matter - 1 - Question 12

A 5 watt source emits monochromatic light ofwavelength 5000 Å. When placed 0.5 m away, itliberates photoelectrons from a photosensitivemetallic surface. When the source is moved to adistance of 1.0 m, the number of photoelectronsliberated will be reduced by a factor of [2007]

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31 Year NEET Previous Year Questions: Dual Nature of Radiation & Matter - 1 - Question 13

The work function of a surface of aphotosensitive material is 6.2 eV. The wavelengthof incident radiation for which the stoppingpotential is 5 V lies in the: [2008]

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31 Year NEET Previous Year Questions: Dual Nature of Radiation & Matter - 1 - Question 14

In the phenomenon of electric discharge throughgases at low pressure, the coloured glow in thetube appears as a result of: [2008]

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31 Year NEET Previous Year Questions: Dual Nature of Radiation & Matter - 1 - Question 15

A particle of mass 1 mg has the same wavelengthas an electron moving with a velocity of 3×10^{6 }ms^{–1}. The velocity of the particle is: [2008]

(mass of electron = 9.1×10^{–31} kg)

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31 Year NEET Previous Year Questions: Dual Nature of Radiation & Matter - 1 - Question 16

The number of photo electrons emitted for lightof a frequency v (higher than the threshold frequency v_{0}) is proportional to: [2009]

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31 Year NEET Previous Year Questions: Dual Nature of Radiation & Matter - 1 - Question 17

The figure shows a plot of photo current versus anode potential for a photo sensitive surface for three different radiations. Which one of the following is a correct statement? [2009]

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31 Year NEET Previous Year Questions: Dual Nature of Radiation & Matter - 1 - Question 18

Monochromatic light of wavelength 667 nm isproduced by a helium neon laser. The poweremitted is 9 mW. The number of photons arrivingper sec on the average at a target irradiated bythis beam is: [2009]

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31 Year NEET Previous Year Questions: Dual Nature of Radiation & Matter - 1 - Question 19

A beam of cathode rays is subjected to crossed Electric (E) and Magnetic fields (B). The fields are adjusted such that the beam is not deflected. The specific charge of the cathode rays is given by: [2010]

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31 Year NEET Previous Year Questions: Dual Nature of Radiation & Matter - 1 - Question 20

A source S1 is producing, 10^{15} photons persecond of wavelength 5000 Å. Another source S_{2} is producing 1.02×10^{15} photons per secondof wavelength 5100Å Then, (power of S_{2})/(power of S_{1}) is equal to : [2010]

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31 Year NEET Previous Year Questions: Dual Nature of Radiation & Matter - 1 - Question 21

The potential difference that must be applied tostop the fastest photoelectrons emitted by anickel surface, having work function 5.01 eV,when ultraviolet light of 200 nm falls on it, mustbe: [2010]

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31 Year NEET Previous Year Questions: Dual Nature of Radiation & Matter - 1 - Question 22

Photoelectric emmision occurs only whenthe incident light has more than a certainminimum [2011]

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31 Year NEET Previous Year Questions: Dual Nature of Radiation & Matter - 1 - Question 23

In the Davisson and Germer experiment, thevelocity of electrons emitted from the electrongun can be increased by [2011]

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31 Year NEET Previous Year Questions: Dual Nature of Radiation & Matter - 1 - Question 24

Light of two different frequencies whosephotons have energies 1 eV and 2.5 eVrespectively illuminate a metallic surface whosework function is 0.5 eV successively. Ratioof maximum speeds of emitted electrons will be[2011]

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31 Year NEET Previous Year Questions: Dual Nature of Radiation & Matter - 1 - Question 25

Electrons used in an electron microscope areaccelerated by a voltage of 25 kV. If the voltageis increased to 100kV then the de–Brogliewavelength associated with the electrons would

Detailed Solution for 31 Year NEET Previous Year Questions: Dual Nature of Radiation & Matter - 1 - Question 25

31 Year NEET Previous Year Questions: Dual Nature of Radiation & Matter - 1 - Question 26

In photoelectric emission process from a metalof work function 1.8 eV, the kinetic energy ofmost energetic electrons is 0.5 eV. Thecorresponding stopping potential is [2011]

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31 Year NEET Previous Year Questions: Dual Nature of Radiation & Matter - 1 - Question 27

The threshold frequency for a photosensitivemetal is 3.3 × 10^{14} Hz. If light of frequency 8.2 × 10^{14} Hz is incident on this metal, the cut-offvoltage for the photoelectric emission is nearly [2011M]

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31 Year NEET Previous Year Questions: Dual Nature of Radiation & Matter - 1 - Question 28

A 200 W sodium street lamp emits yellow lightof wavelength 0.6 μm. Assuming it to be 25% efficient in converting electrical energy to light,the number of photons of yellow light it emitsper second is [2012]

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31 Year NEET Previous Year Questions: Dual Nature of Radiation & Matter - 1 - Question 29

Monochromatic radiation emitted when electronon hydrogen atom jumps from first excited tothe ground state irradiates a photosensitivematerial. The stopping potential is measured tobe 3.57 V. The threshold frequency of the materialsis : [2012]

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31 Year NEET Previous Year Questions: Dual Nature of Radiation & Matter - 1 - Question 30

If the momentum of electron is changed by P,then the de Broglie wavelength associated withit changes by 0.5%. The initial momentum ofelectron will be : [2012M]

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