Light of wavelength is incident on a metal whose threshold wavelength is

PHYSICS · Single correct · A Level · Physics · Particles and radiation · Particles and radiation

Problem

Light of wavelength

450\,\text{nm}

is incident on a metal whose threshold wavelength is

600\,\text{nm}

. Using

h = 6.63\times10^{-34}\,\text{J s}

c = 3.0\times10^{8}\,\text{m s}^{-1}

and

e = 1.6\times10^{-19}\,\text{C}

, calculate the stopping potential

V_0

. (a)

1.38\,\text{V}

(b)

0.52\,\text{V}

(c)

0.69\,\text{V}

(d)

2.07\,\text{V}