The wavelength λ_e of an electron and λ_p of a photon are of same energy E are related by

For photoelectric emission from certain metal the cut-off frequency is v. If radiation of frequency 2v impinges on the metal plate, the maximum possible velocity of the emitted electron will be (m is the electron mass)

Monochromatic radiation emitted when electron on hydrogen atom jumps from first excited to the ground state irradiates a photosensitive material. The stopping potential is measured to be 3.57 V. The threshold frequency of the materials is

A 200 W sodium street lamp emits yellow light of wavelength 0.6 µm. Assuming it to be 25% efficient in converting electrical energy to light, the number of photons of yellow light it emits per second is

Two radiations of photons energies 1 eV and 2.5 eV,successively illuminate a photosensitive metallic surface of work function 0.5 eV.The ratio of the maximum speeds of the emitted electrons is

If the momentum of electron is changed by P, then the de Broglie wavelength associated with it changes by 0.5%.The initial momentum of electron will be

The threshold frequency fora photosensitive metal is 3.3 × 10¹⁴ Hz. If light of frequency 8.2 ×10¹⁴ Hz is incident on this metal, the cut-off voltage for the photoelectric emission is nearly

In photoelectric emission process from a metal of work function 1.8 eV, the kinetic energy of most energetic electrons is 0.5 eV. The corresponding stopping potential is

Photoelectric emmision occurs only when the incident light has more than a certain minimum

The potential difference that must be applied to stop the fastest photoelectrons emitted by a nickel surface, having work function 5.01 eV, when ultraviolet light of 200 nm falls on it, must be