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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Difficulty Level:

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

1.

2.

3.

4.

Concept Questions :-

De-broglie wavelength
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Difficulty Level:

1.

2.

3.

4.

Concept Questions :-

Electron emission
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Difficulty Level:

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

Concept Questions :-

Einstein photo-electric equation
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Difficulty Level:

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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Difficulty Level:

When the light of wavelength $\mathrm{\lambda }$ 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 $\frac{\mathrm{\lambda }}{2}$ is used instead of $\mathrm{\lambda }$:

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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Difficulty Level:

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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Difficulty Level:

When the light of wavelength  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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Difficulty Level:

If the momentum of a photon is p, then its energy is :

1.  pc

2.

3.

4.  $\frac{1}{4}\mathrm{pc}$

Concept Questions :-

De-broglie wavelength