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(A) According to Einstein's photoelectric equation,the kinetic energy of the emitted electron is given by:$K_{max} = hv - hv_0$Since $K_{max}$ must be

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(A) According to Einstein's photoelectric equation,the kinetic energy of the emitted electron is given by:$K_{max} = hv - hv_0$Since $K_{max}$ must be positive for photoelectric emission to occur,we must have:$hv > hv_0$ or $v > v_0$Here,$v$ is the frequency of incident light and $v_0$ is the threshold frequency. Thus,the photoelectric effect occurs only when the incident light has a frequency greater than a certain minimum value,known as the threshold frequency.

The photoelectric effect occurs only when the incident light has more than a certain minimum:

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