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

PHYSICS · Subjective · A Level · Physics · Particles and radiation · Particles and radiation

Problem

Monochromatic light of frequency

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

produces a stopping potential of

1.5\,\text{V}

for a certain metal. Determine the threshold wavelength of this metal in nanometres. (

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

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

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

)