Physics

Problem

For a certain metal surface the threshold frequency is

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

. What is its threshold wavelength

\lambda_0

? a)

4.5\times10^{-7}\,\text{m}

6.7\times10^{-7}\,\text{m}

1.1\times10^{-7}\,\text{m}

6.7\times10^{-8}\,\text{m}