When ultraviolet light with a wavelength of 400 nm falls on a certain metal surface, the maximum kinetic energy of the emitted photoelectrons is measured to be 1.10 ev. part a what is the maximum kinetic energy of the photoelectrons when light of wavelength 295 nm falls on the same surface? emax = ?

Question

Physics

Gringo

29 January, 20:29

When ultraviolet light with a wavelength of 400 nm falls on a certain metal surface, the maximum kinetic energy of the emitted photoelectrons is measured to be 1.10 ev. part a what is the maximum kinetic energy of the photoelectrons when light of wavelength 295 nm falls on the same surface? emax = ?

+3

Answers (1)

Know the Answer?

Margaret Downs · Answer 1

A general relationship between Kinetic Energy (KE) and wavelength (y) is that KE is inversely proportional to square of y. That is,

KE α 1/y^2 = > KE = k/y^2 where k is a constant of proportionality.

For KE = 1.10 ev, and y = 400 nm;

k = KE*y^2 = 1.10*400 = 176,000 ev. nm^2

For y = 295 nm,

KE = k/y^2 = 176,000/295^2 = 2.02 ev.

Therefore, e max = 2.02 ev