Question

Cu metal has work function 4.8ev can show photoelectric effect if wavelength of photon is

Answer 1

The question is incomplete.

Answer 2

Answer:

Concept:

We can relate the work function, , and maximum electron energy, max, given wavelength, , using the formula = ℎ − max, where ℎ is the Planck constant and is the speed of light.

Explanation:

$Work function \left(\mathrm{W}_{0}\right)=\frac{\mathrm{hc}}{\lambda_{0}} \\\\or \ \lambda_{0}=\frac{h c}{W_{0}} \begin{aligned}&\therefore \lambda_{0}=\frac{6.6 \times 10^{-34} \times 3 \times 10^{8}}{4.8 \times 1.6 \times 10^{-19}} \\&\Rightarrow \lambda_{0}=2578 \times 10^{-10} \\&\Rightarrow \lambda_{0}=2578 \AA\end{aligned}$

Cu metal has work function 4.8ev can show photoelectric effect if wavelength of photon is 2578 A

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