Question

In a photoelectric experiment, the stopping potential for incident light of wavelength \(4000\ \text{\AA}\) is \(2\ \text{V}\). If the wavelength is changed to \(3000\ \text{\AA}\), the new stopping potential will be approximately \[ (\text{Use }h=4.14\times 10^{-15}\ \text{eV s},\ c=3\times 10^8\ \text{m/s}) \]

• A. \(2\ \text{V}\)
• B. \(3.03\ \text{V}\)
• C. \(4.14\ \text{V}\)
• D. \(1.5\ \text{V}\)

Hint:

For photoelectric effect, use \(E=\frac{1240}{\lambda(\text{nm})}\) eV and then apply \(E=\phi+V_s\).

Answer 1

The Correct Option is B