If V be the accelerating voltage, then the maximum frequency of continuous x-rays is given by

1.  ehV  

2.  hVe  

3.  eVh  

4. heV

Subtopic:  Photoelectric Effect: Experiment |
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The maximum kinetic energy of photoelectron emitted from the surface of work function f due to incidence of light of frequency n is E. If the frequency of incident light is doubled, then maximum kinetic of emitted photon will be

1.  2E

2.  2E - f

3.  2E + f

4.  2E + 2f

Subtopic:  Einstein's Photoelectric Equation |
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What is the de-Broglie wavelength associated with an electron accelerated through a voltage of 900 V?

1.  0.31 Ao  

2.  0.41 Ao 

3.  0.5 Ao  

4.  0.16 A0

Subtopic:  De-broglie Wavelength |
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What is the de-Broglie wavelength of a neutron in thermal equilibrium with heavy water at a temperature T (Kelvin) and mass m?

1. hmkT

2. h3mkT

3. 2h3mkT 

4. 2hmkT

Subtopic:  De-broglie Wavelength |
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If an electron of mass m with a de-Broglie wavelength of l falls on the target in an X-ray tube, the cut-off wavelength ( λ0) of the emitted X-ray will be:

1. λ0=2mcλ2h         

2. λ0=2hmc

3. λ0=2m2c2λ3h2       

4. λ0=λ

Subtopic:  De-broglie Wavelength |
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Photons with energy 5 eV are incident on a cathode C in a photoelectric cell. The maximum energy of emitted photoelectrons is 2 eV. When photons of energy 6 eV are incident on C, no photoelectron will reach the anode A, if the stopping potential of A relative to C is

1. +3 V

2. +4 V

3. - 1V

4. -3 V

Subtopic:  Einstein's Photoelectric Equation |
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When a metallic surface is illuminated with radiation of wavelength λ, the stopping potential is V. If the same surface is illuminated with radiation of wavelength 2λ, the stopping potential is V4 .The threshold wavelength for metallic surface is:

(a) 5λ                (b)52λ

(c) 3λ                (d) 4λ

Subtopic:  Photoelectric Effect: Experiment |
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An electron of mass m and a photon have the same energy E. Find the ratio of de-Broglie wavelength associated with the electron to that associated with the photon. (c is the velocity of light)

1. E2m1/22. c2mE1/23. 1c2mE1/24. 1cE2m1/2
 

Subtopic:  De-broglie Wavelength |
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A radiation of energy 'E' falls normally on a perfectly reflecting surface. The momentum transferred to the surface is (c=velocity of light)

1. E/c

2. 2E/c

3. 2E/c2

4. E/c2

Subtopic:  Particle Nature of Light |
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A certain metallic surface is illuminated with monochromatic light of wavelength λ. The stopping potential for photoelectric current for this light is 3Vo. If the same surface is illuminated with light of wavelength 2λ, the stopping potential is Vo. The photoelectric effect's threshold wavelength for this surface is?

1. 6λ

2. 4λ

3. λ/4

4. λ/6

Subtopic:  Einstein's Photoelectric Equation |
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