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(A) The minimum frequency required for the emission of electrons is called threshold frequency,below which no photoelectron is emitted. This is denote

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(A) The minimum frequency required for the emission of electrons is called threshold frequency,below which no photoelectron is emitted. This is denoted by $v_0$.The minimum energy required for the emission of photoelectrons from a metal is called the work function of that metal,denoted by $W$.The relationship is given by $W = h v_0$,where $h$ is Planck's constant.

$A$ metal surface emits photoelectrons when the incident radiation possesses a minimum.....

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