In a photoelectric experiment, frequency f = 1.5f₀ (f₀ : threshold frequency). If the frequency of light is changed to f/2, then photocurrent becomes (intensity of light has doubled)

Maximum wavelength of light source such that photoelectron can be ejected from material of work function 3 eV is

A photocell works on the principle of

The work function of a metal is w₀ and l is wavelength of incident radiation. There is no emission of photoelectron when

The work function of a metal is w0 and $$ $\lambda$ is wavelength of incident radiation. There is no emission of photoelectron when

Two stream of photons, possessing energies equal to twice and ten times the work function of metal are incident on the metal surface successively. The value of ratio of maximum velocities of the photoelectrons emitted in the two respective cases is x : y. The value of x is………