Why regardless of the intensity of light, the photoelectric emission not occur below the threshold frequency?

<p>Photons do not have enough energy (<math > <mrow> <mi>E</mi> <mo>=</mo> <mi>h</mi> <mi>? </mi> &lt;!- Greek letter nu -&gt; </mrow> </math> )to overcome the work function (? ) of the material below the threshold frequency.The energy per photon remains too low to liberate electrons even if the light intensity is increased, so photoelectric emission cannot occur.</p>

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