The number of photo-electrons emitted per second from a metal surface increases when

(1) The energy of incident photons increases

(2) The frequency of incident light increases

(3) The wavelength of the incident light increases

(4) The intensity of the incident light increases

The work function for tungsten and sodium are 4.5 eV and 2.3 eV respectively. If the threshold wavelength $\mathrm{\lambda }$ for sodium is 5460 Å, the value of $\mathrm{\lambda }$ for tungsten is

(1) 5893 Å                   

(2) 10683 Å

(3) 2791 Å                   

(4) 528 Å

Light of wavelength 4000 Å is incident on a sodium surface for which the threshold wave length of photo – electrons is 5420 Å. The work function of sodium is

(1) 4.58 eV                 

(2) 2.29 eV

(3) 1.14 eV                 

(4) 0.57 eV

Stopping potential for photoelectrons 

(1) Does not depend on the frequency of the incident light

(2) Does not depend upon the nature of the cathode material

(3) Depends on both the frequency of the incident light and nature of the cathode material

(4) Depends upon the intensity of the incident light

The maximum wavelength of radiation that can produce photoelectric effect in a certain metal is 200 nm. The maximum kinetic energy acquired by electron due to radiation of wavelength 100 nm will be 

(1) 12.4 eV                     

(2) 6.2 eV

(3) 100 eV                     

(4) 200 eV

When the light source is kept 20 cm away from a photo cell, stopping potential 0.6 V is obtained. When source is kept 40 cm away, the stopping potential will be 
1. 0.3 V                  2. 0.6 V
3. 1.2 V                  4. 2.4 V

If in a photoelectric experiment, the wavelength of incident radiation is reduced from 6000 Å to 4000 Å then

(1) Stopping potential will decrease
(2) Stopping potential will increase
(3) Kinetic energy of emitted electrons will decrease
(4) The value of work function will decrease

Which of the following is dependent on the intensity of incident radiation in a photoelectric experiment

(1) Work function of the surface

(2) Amount of photoelectric current

(3) Stopping potential will be reduced

(4) Maximum kinetic energy of photoelectrons

Which of the following statements is correct

(1) The current in a photocell increases with increasing frequency of light

(2) The photocurrent is proportional to applied voltage

(3) The photocurrent increases with increasing intensity of light

(4) The stopping potential increases with increasing intensity of incident light

4 eV is the energy of the incident photon and the work function in 2eV. What is the stopping potential ?

(1) 2V                   

(2) 4V

(3) 6V                   

(4) $2\sqrt{2} \mathrm{V}$