The threshold wavelength of photo sensitive metal is 5000 A .Find the velocity of the photoelectrons emitted by it when wavelength of 4000A is incident on it.

The photo electric threshold for a metal surface is 5800 Å. Calculate the kinetic energy of a photoelectron, when a light of wavelength 4500 Å is incident on the metal surface.

The threshold wavelength of a photosensitive metal is 662.5 nm. If this metal is irradiated with a radiation of wavelength 331.3 nm, find the maximum kinetic energy of the photoelectrons. If the wavelength of radiation is increased to 496.5 nm, calculate the change in maximum kinetic energy of the photoelectrons. (Planck's constant h = 6.625 xx 10^(-34) Js and "speed of light in vacuum" = 3 xx 10^(8)ms^(-1) )

Threshold wavelength for photoelectric emission from a metal surface is 5200 A. Photoelectrons will be emitted when this surface is illuminated with monochromatic radiation from

The threshold wavelength for a metal is 4000 Å. A radiation of wavelength 5000 Å is incident on the metal. Can it cause P.E.E?

What is the threshold wavelength of a metal if the photoelectric work function of the metal is 5 eV?