The photon theory predicts that the threshold frequency f0 for the photoelectric effect

(A) is a universal constant.
(B) depends on the work-function w.
(C) is usually zero.
(D) depends on the light intensity.

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The photon theory predicts that the threshold frequency f0 for the photoelectric effect

(A) is a universal constant. --- No.

It depends on the target metal.


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The photon theory predicts that the threshold frequency f0 for the photoelectric effect

(B) depends on the work-function w. -- Yes.

For K.E.=0, -- hf0 = w -- so -- f0 = w/h

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The photon theory predicts that the threshold frequency f0 for the photoelectric effect

(C) is usually zero. --- No.

The wave theory predicts that.


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The photon theory predicts that the threshold frequency f0 for the photoelectric effect

(D) depends on the light intensity. --- No.

Every photon is independent.


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117.3