Question

1. The work function of a photosensitive material is
4.0 eV. The longest wavelength of light that can
cause photon emission from the substance is
(approximately)

(1) 310 nm

(2) 3100 nm
(3) 966 nm
(4) 31 nm
​

Answer 1

Answer:

E = (hc)/w

h = Planck's Constant

c = speed of light

w = wavelength

You can find out.

Explanation:

w = 1280/4

Answer:

(1) 320 nm