The velocity of photoelectrons is `10^6 m//s` when light of `4000A^@` falls on the metal surface. Calculate the work function of the metal.

The velocity of photoelectrons is 10^6 ms^-1 when light of wavelength 6000 A^@ falls on a metal surface. Calculate the work function of the metal.

Radiation of wavelength 5000 A^@ incidents on a metal surface to just cause photo emission. Calculate the work function of the metal.

State and explain Faraday 's laws of electrolysis. A current of 5 amperes is passed through an electrolyte for 15 minutes when 4 gms of the metal was deposited. Calculate the ECE of the metal.

Fill in the blank spaces with appropirate answers: When blue light incidents on a photosensitive surface electrons are emitted but when red light falls on the same surface there is no emission of electrons. Then the threshold wavelength is _______ than blue and __________ than red.

A current of 5 amperers is passed through an electrolyte for 15 minutes when 3 gm of the metal is deposited . Calculate the equivalent weight of the metal.