Photo electric emission is observed from a metallic surface for frequencies $$v1$$ $$andv2$$ of the incident light $$rays($$ν$$1$$ν$$2)$$. If the maximum values of kinetic energy of the photo elections emitted in the two cases are in the ratio of $$1$$:K, then the threshold frequency of the metallic surface is

Question

Photo electric emission is observed from a metallic  surface for frequencies $$v1$$     $$andv2$$       of the incident  light $$rays($$ν$$1$$>ν$$2)$$.      If the maximum  values of kinetic energy of the photo elections emitted in the two cases are  in the ratio of $$1$$:K, then the threshold frequency of the metallic surface is

Infinity Learn · Accepted Answer

K.$$E=hv$$−$$hv0=h(v$$−$$v0)$$       $$kE1kE2=v1$$−$$v0v2$$−$$v0=1k$$     $$kv1$$−$$kv0=v2$$−$$v0$$⇒$$kv1$$−$$v2=kv0$$−$$v0$$     $$kv1$$−$$v2=v0(k$$−$$1)r0$$     $$v0=kv1$$−$$v2(k$$−$$1)$$

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Photo electric emission is observed from a metallic surface for frequencies v1 andv2 of the incident light rays(ν1>ν2). If the maximum values of kinetic energy of the photo elections emitted in the two cases are in the ratio of 1:K, then the threshold frequency of the metallic surface is

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