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

In a photoelectric effect experiment, the slope of the graph between the stopping potential and the incident frequency will be

Which of the following is NOT observed in Lenard's photoelectric experiment?

Air becomes conducting when the pressure ranges between

In Lenard's experiment, a metal with a work function of 2.0 eV is illuminated by light of frequency $6 imes 10^{14}$ Hz. What is the kinetic energy of the emitted photoelectrons? (h = $6.63 imes 10^{-34}$ Js)

A metal surface is illuminated by a light of given intensity and frequency to cause photoemission. If the intensity of illumination is reduced to one-fourth of its original value, then the maximum kinetic energy of the emitted photoelectrons would become

The collector plate in an experiment on photoelectric effect is kept vertically above the emitter plate. Light source is put on and a saturation photo current is recorded. An electric field is switched on which has a vertically downward direction

The frequency of a photon, having energy $100\;eV$ is ($h = 6.6 imes {10^{ - 34}}J$-s)

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

When monochromatic radiation of intensity $I$ falls on a metal surface, the number of photoelectron and their maximum kinetic energy are $N$ and $T$ respectively. If the intensity of radiation is $2I,$ the number of emitted electrons and their maximum kinetic energy are respectively

The frequency and intensity of a light source are doubled. Consider the following statements

I. Saturation photocurrent remains almost the same.

II. Maximum kinetic energy of the photoelectrons is doubled.