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Dual Nature of Radiation and Matter — Physics STD 12 Science — Question

Maharashtra BoardEnglish MediumSTD 12 SciencePhysicsDual Nature of Radiation and Matter2 Marks
Question
Define: (a) Threshold frequency (b) Photoelectric work function.
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Answer

threshold frequency:
The minimum frequency of incident radiation required to start photoemission in any photosensitive material is known as the threshold frequency.
photoelectric work function:
The photoelectric work function is defined as the minimum photon energy that ejects an electron from the metal.
It is equal to $hv_0$, where h is Planck’s constant and $v_0$ is the threshold frequency for the metal.

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