Monochromatic light of frequency produces a stopping potential of for a certain metal

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

Problem

Monochromatic light of frequency

5.0\times10^{14}\,\text{Hz}

produces a stopping potential of

0.5\,\text{V}

for a certain metal. When the frequency is increased to

9.0\times10^{14}\,\text{Hz}

, the stopping potential becomes

2.1\,\text{V}

. Calculate the numerical value of Planck constant

h

(in

\text{J\,s}

) obtained from these data. (a)

2.8\times10^{-34}

(b)

6.4\times10^{-34}

(c)

1.6\times10^{-34}

(d)

8.4\times10^{-34}