Question

The work function $(W_0)$ of metals A, B and C is 2.25, 2.42 and 3.7 eV respectively. These metals were irradiated with light of wavelength 400 nm. Identify the metals from which photoelectrons are emitted $(h = 6.6 \times 10^{-34} Js; c = 3 \times 10^8 ms^{-1}; 1 eV = 1.6 \times 10^{-19} J)$

• A. A & B only
• B. A, B & C
• C. A & C only
• D. B & C only

Hint:

A convenient formula is \[ E(\text{eV})=\frac{1240}{\lambda(\text{nm})} \] which quickly gives photon energy in electron volts.

Answer 1

The Correct Option is A