Einsteins Photoelectric Equation

When photons of energy h$\nu$ fall on an aluminium plate (of work function E₀), photoelectrons of maximum kinetic energy K are ejected. If the frequency of the radiation is doubled, the maximum kinetic energy of the ejected photoelectrons will be:

1. $K+E_0$

2. 2K

3. K

4. K+h$\nu$

The work function of the surface of a photosensitive material is eV. In which region does the wavelength of the incident radiation, for which the stopping potential is V, lie?
1. ultraviolet region.
2. visible region.
3. infrared region.
4. X-ray region.

The potential difference that must be applied to stop the fastest photoelectrons emitted by a nickel surface, having work function 5.01 eV, when ultraviolet light of 200 nm falls on it, must be:

1. 2.4 V

2. -1.2 V

3. -2.4 V

4. 1.2 V

Light of two different frequencies, whose photons have energies of eV and eV respectively, illuminates a metallic surface whose work function is eV successively. The ratio of maximum speeds of emitted electrons will be:
1.
2.
3.
4.

For photoelectric emission from certain metals, the cutoff frequency is If radiation of frequency $\mathrm{}$ impinges on the metal plate, the maximum possible velocity of the emitted electron will be:
( is the electron mass)

1.		2.
3.		4.

A photoelectric surface is illuminated successively by the monochromatic light of wavelength and . If the maximum kinetic energy of the emitted photoelectrons in the second case is times that in the first case, the work function of the surface of the mineral is:
[ = Plank’s constant, = speed of light]

1.		2.
3.		4.

Photons with energy are incident on a cathode in a photoelectric cell. The maximum energy of emitted photoelectrons is When photons of energy are incident on no photoelectrons will reach the anode if the stopping potential of relative to is:
1.
2.
3.
4.

The photoelectric threshold wavelength of silver is What will be the velocity of the electron ejected from a silver surface by the ultraviolet light of wavelength
(Given $$ and $\mathrm{}$ ${\mathrm{}}^{}$)
1.
2.
3.
4.

When the light of frequency (where is threshold frequency), is incident on a metal plate, the maximum velocity of electrons emitted is When the frequency of the incident radiation is increased to the maximum velocity of electrons emitted from the same plate is What will be the ratio of to

1.		2.
3.		4.

When two monochromatic lights of frequency, and are incident on a photoelectric metal, their stopping potential becomes and , respectively. The threshold frequency for this metal is:

1.		2.
3.		4.