The threshold frequency for a metal is 10^{15 | vedclass

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(A) Given: Threshold frequency $f_0 = 10^{15} \ Hz$ and wavelength $\lambda = 4000 \ \mathring A = 4000 	imes 10^{-10} \ m$. The frequency of the inc

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Photoelectric effect does not occur.

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(A) Given: Threshold frequency $f_0 = 10^{15} \ Hz$ and wavelength $\lambda = 4000 \ \mathring A = 4000 	imes 10^{-10} \ m$. The frequency of the incident light is $f = \frac{c}{\lambda} = \frac{3 	imes 10^8}{4000 	imes 10^{-10}} = \frac{3 	imes 10^8}{4 	imes 10^{-7}} = 0.75 	imes 10^{15} \ Hz$. For the photoelectric effect to occur,the incident frequency $f$ must be greater than or equal to the threshold frequency $f_0$ $(f \ge f_0)$. Here,$0.75 	imes 10^{15} \ Hz Since the incident frequency is less than the threshold frequency,no photoelectric effect occurs.

The threshold frequency for a metal is $10^{15} \ Hz$. Choose the correct statement when light of wavelength $4000 \ \mathring A$ is incident on it.

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