In Lenard's experiment, if the intensity of the incident light is doubled while keeping the frequency constant, what will be the effect on the stopping potential?

Which of the following event, support the quantum nature of light?

When ultraviolet rays are incident on metal plate, then photoelectric effect does not occur. It occurs by the incidence of

What will be the number of photons emitted per second by a 10 W sodium vapour lamp assuming that 90% of the consumed energy is converted into light? Wavelength of sodium light is 590 nm, $h = 6.63 imes {10^{ - 34}}$J-s.

Which of the following event, support the quantum nature of light?

Positive rays were discovered by

When subjected to a transverse electric field, cathode rays move

Light of frequency $1.5$ times the threshold frequency is incident on a photosensitive material. If the frequency is halved and intensity is doubled, what will be the photoelectric current?

Ultraviolet radiation of 6.2eV falls on an aluminium surface (work function 4.2eV). The kinetic energy in joule of the fastest electron emitted is approximately

The number of photo-electrons emitted per second from a metal surface increases when

When ultraviolet radiation is incident on a surface, no photoelectrons are emitted. If a second beam causes photoelectrons to be ejected, it may consist of