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DUAL NATURE OF RADIATION AND MATTER — Physics STD 12 Science — Question

Bihar BoardEnglish MediumSTD 12 SciencePhysicsDUAL NATURE OF RADIATION AND MATTER2 Marks
Question
How the photoelectric effect depends on time? Explain.
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Answer

→Experimental studies of photoelectric effect have shown that if the frequency of incident radiation is greater than the threshold frequency of a photosensitive metal, electrons are instantaneously emitted from the metal, even for low intensities.
→If the frequency is greater than the threshold frequency, electrons are emitted in only $10^{-9}$ sec or less.

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