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

Gujarat BoardEnglish MediumSTD 12 SciencePhysicsDual Nature of Radiation and Matter2 Marks
Question
On what does the work function of a metal depend?
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Answer

The value of work function depends on temperature. But since this dependence is negligible, it can be considered fixed for the substance. The work function is expressed as $W _0$ or $\phi_0$. Its value is different for different substances. For tungsten its value is around 4.5 eV . Its value is very small for alkali metals. For sodium its value is 1.5 eV .

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