Which of the following statements is correct | vedclass

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(B) The photoelectric effect occurs when light of a sufficiently high frequency (or wavelength shorter than the threshold wavelength) strikes a metal

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$2$. Photoemission occurs if the wavelength is less than a critical value.

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(B) The photoelectric effect occurs when light of a sufficiently high frequency (or wavelength shorter than the threshold wavelength) strikes a metal surface. According to Einstein's photoelectric equation, $KE_{max} = h
u - \Phi$, where $\Phi$ is the work function. $1$. Thermionic emission occurs at high temperatures, not photoelectric emission. $2$. Photoemission occurs if the incident wavelength $\lambda$ is less than the threshold wavelength $\lambda_0$ (critical value). $3$. The $KE$ of photoelectrons depends on the frequency of incident radiation, not the amplitude. $4$. The photoelectric current is proportional to the intensity of incident radiation, not the frequency. Therefore, statement $2$ is correct.

Which of the following statements is correct regarding the photoelectric effect?

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