Two monochromatic radiations blue and violet of the same intensity are incident on a photosensitive surface cause photoelectric emission. Would the no. of electrons emitted per sec be equal in the two cases? justify

Draw a plot showing the variation of photoelectric current versus the intensity of incident radiation on a given photosensitive surface.

Radiation of wavelength 5000 oversetcircA and of intensity 2xx10^-3w cm^-2 falls on a photosensitive surface. Assuming that every absorbed photon results in the ejection of photoelectron, find how many photoelectrons are produced per cm^2 per sec.

The figure shows the stopping potential for the phototelectron versus (1/lambda) graph for two metals A and B, lambda being the wavelength of incident light If the distance between the light source and the surface of metal A is increased, how will the stopping potentail for the electrons emitted from it be affected? justify your answer.

The question given below consist of an assertion (A) and a reason ( R). Use the following key to choose the appropriate answer to these questions from the codes (a), (b), ( c) and (d) given below: (a) Both A and R are true and R is the correct explanation of A. (b) Both A and R are true but R is NOT the correct explanation of A. (c) A is true but R is false. (d) A is false and R is also false. Assertion: Kinetic energy of photo electrons emitted by a photosensitive surface depends upon the intensity of incident photon. Reason: The ejection of electrons from metallic surface is possible with frequency of incident photon below the threshold frequency.

Light of intensity 10^-5 Wm^-2 falls on a sodium photocell of surface area 2 cm^2 . Assuming that the top 5 layers of sodium absorb the incident energy, estimate the time required for photoelectric emission on the wave picture of radiation. The work function for the metal is given to be about 2 eV. what is the implication of your answer?

The figure VSAQ 29 shows a plot of three curves a,b,c, showing the variation of photocurrent in collector plate potential for three different intensities I_1 , I_2 and I_3 having frequencies v_1 , v_2 and v_3 respectively incident on a photosensitive surface. Point out the two curves for which the incident raidations have the same frequency but different intensities.

Ultraviolet light is incident on two photosensitive materials, having work functions W_1 and W_2 , where W_1 > W_2 . In which case will the kinetic energy of emitted electrons be greater? Why?

Light from a dicharge tube containing hydrogen atoms falls on the surface of sodium.The kinetic energy of the fastest electrons emitted from sodium is 0.73 eV.The work function for sodium is 1.82 eV. Find the energy of the photons causing the photoelectric emission,

Photons of frequency v are incident on the surfaces of two metals A and B of threshold frequencies 3/4v and 2/3 v respectively. The ratio of the maximum kinetic energy of electrons emitted from A to B is

When monochromatic light is incident on a surface separating two media, the reflected and refracted light both have the same frequency as the incident frequency. Explain, why.