The work function of a substance is 3.0 eV. The longest wavelength of light that can cause the emission of photoelectrons from this substance is approximately

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Solution

Q.
The work function of a substance is 3.0 eV. The longest wavelength of light that can cause the emission of photoelectrons from this substance is approximately [2024]

1 215 nm

2 414 nm

3 400 nm

4 200 nm

Ans.
(2)

For photoelectric effect: $λ \leq \frac{h c}{W_{e}}$

$λ \leq \frac{1240 nm - eV}{3 eV}$

$λ \leq 413.33 nm$

$λ_{\max} \approx 414 nm$

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