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

Concept Questions :-

Einstein photo-electric equation
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The de-Broglie associated with an electron accelerated through a voltage of 900 V is:

1.  0.31 Ao  

2.  0.41 Ao 

3.  0.5 Ao  

4.  0.16 A0

Concept Questions :-

De-broglie wavelength
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A 200W sodium street lamp emits yellow light of wavelength 0.60μm. Assuming it to be50% efficient, in converting electrical energy into light, the number of photons of yellowlight emitted per second is nearly equal to-

1.  3 x 1019  

2.  3 x 1020  

3.  1.5 x 1020  

4.  6 x 1020

Concept Questions :-

Electron emission
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Monochromatic radiation emitted when an electron in a hydrogen atom jumps from the first excited state to the ground state irradiates a photosensitive material. The stopping potential is found to be 4V. The threshold wavelength of the material is

1. 2×10-7 m2. 2×10-6 m3. 4×10-7 m4. 4×10-6  m

Concept Questions :-

Einstein photo-electric equation
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In a photoelectric experiment using a metal of work function 1.8 eV, if the maximum kinetic energy of emitted electrons is 1.5eV, then the corresponding value to stopping potential is:

1.  1.8V

2.  3.3V

3.  0.3V

4.  1.5V

Concept Questions :-

Photoelectric effect experiment
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Electrons used in an electron microscope are accelerated by a voltage of 25 kV. If the accelerating voltage is reduced to 6.25 kV, the resolving power of the microscope would:

1. Increase to 4 time

2. Increases to 2 times

3. Decrease to half

4. Decrease to 1/4th

Concept Questions :-

De-broglie wavelength
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When the light of wavelength λ is used in a photoelectric experiment, the maximum kinetic energy of emitted electrons is found to be K. What will the maximum kinetic energy of the photoelectrons when the light of wavelength λ2 is used instead of λ:

1. Zero

2. Non zero but less than 2 K

3. 2K

4. More than 2K

Concept Questions :-

Einstein photo-electric equation
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The concept of matter-wave was given by:

1.  de-Broglie

2.  Einstein

3.  Maxwell

4.  Bohr

Concept Questions :-

De-broglie wavelength
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When the light of wavelength λ = 3100 Ao is made to fall on metal in a photoelectric experiment, the maximum kinetic energy of emitted electrons is found to be 2.5eV. The work function of the metal is:

1.  2.5eV

2.  3.1eV

3.  0.9eV

4.  1.5eV

Concept Questions :-

Einstein photo-electric equation
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If the momentum of a photon is p, then its energy is :

1.  pc

2.  12pc  

3.  p22c  

4.  14pc

 

Concept Questions :-

De-broglie wavelength
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