Question

A metal surface is illuminated by light of two different wavelengths \(207\text{ nm}\) and \(414\text{ nm}\) . The maximum speeds of photoelectrons corresponding to these wavelengths are \(u_1\) and \(u_2\) respectively with \(u_1 : u_2 = 2 : 1\). The work function of the metal is (\(hc = 1242\text{ eV nm}\))

• A. \(1.6\text{ eV}\)
• B. \(2.0\text{ eV}\)
• C. \(2.4\text{ eV}\)
• D. \(3.0\text{ eV}\)

Hint:

Shortcut: $K \propto v^2$

Answer 1

The Correct Option is B