Ultraviolet light of wavelength `2271 Å` from a 100 W mercury source irradiates a photo-cell made of molybdenum metal. If the stopping potential is `-1.3 V`, estimate the work function of the metal. How would the photo-cell respond to a high intensity `(~10^(5) W m^(2))` red light of wavelength `6328 Å` produced by a He-Ne laser ?

Light of wavelength 488 nm is produced by an argon laser which is used in the photoelectric effect. When light from this spectral line is incident on the emitter, the stopping (cut-off) potential of photoelectrons is 0.38 V. Find the work function of the material from which the emitter is made.

Monochromatic radiation of wavelength "640.2 nm "(1nm = 10^(-9) m) from a neon lamp irradiates photosensitive material made of caesium on tungsten. The stopping voltage is measured to be 0.54 V. The source is replaced by an iron source and its 427.2 nm line irradiates the same photo-cell. Predict the new stopping voltage.

Calculate the retarding potential required to stop the photoelectrons emitted from a metal surface of work function 1.2 eV , when light of frequency 6.3xx 10^(14) Hz is incident on it

Lithium has a work function of 2.3 eV. It is exposed to light of wavelength 4.8 xx 10^(-7) m. Find the maximum kinetic energy with which the electron leaves the surface. What is the longest wave length which can produce the photo electrons ? Data : W = 2.3 eV, h=6.626 xx 10^(-34)Js, e=1.6 xx 10^(-19) C. Longest wavelength = ? , Kinetic energy = ?

For a metal the maximum wavelength required for photoelectron emission is 340 nm, find the work function. If the radiation of wavelength 250 nm falls on the surface of the given metal. Find the maximum kinetic energy of emitted photo electrons in eV. Given Planck's constant = 6.625 xx 10^(-34) Js , velocity of light in vacuum is 3 xx 10^(8)ms^(-1) .