What is the maximum kinetic energy of electrons ejected from barium when illuminated by white light, to 750 nm?

J

Explanation:

The complete statement is given as

What is the maximum kinetic energy of electrons ejected from barium (Wo = 2.48 eV) when illuminated by white light, 400 nm to 750 nm ?

= wavelength of the white light = 400 nm = 400 x 10⁻⁹ m

= speed of white light = 3 x 10⁸ ms⁻¹

Energy of the white light is given as

= Work function of barium = 2.48 eV = 2.48 x 1.6 x 10⁻¹⁹ J

= Maximum kinetic energy

Using photoelectric equation we have

i would say