Question

in a photoelectric experiment, kinetic energy of photoelectron is 18.2 x 10^19 J. the wavelength of incident light is X x 10^-8 m, if work function of metal is 1eV, then valur of x is _______

Answer 1

Answer:

Correct option is

C

3.4×10

−19

J

Energy of incident radiation is E=

λ

hc

=

3×10

−7

6.6×10

−34

×3×10

8

=6.6×10

−19

J.

Also, work function is ϕ=2×1.6×10

−19

J=3.2×10

−19

J.

Hence, maximum kinetic energy of emitted photo electrons will be 6.6×10

−19

J−3.2×10

−19

J=3.4×10

−19

J.