Question:
Among the following photosensitive substances, the one which emits electrons when it is illuminated by visible light is
Among the following photosensitive substances, the one which emits electrons when it is illuminated by visible light is
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Alkali metals like sodium and potassium have low work functions, so they are more photo-sensitive.
Updated On: Apr 29, 2026
- magnesium
- zinc
- sodium
- cadmium
- platinum
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The Correct Option is C
Solution and Explanation
A substance will emit electrons in visible light only if its work function is low enough.
Among the given metals, sodium has a comparatively low work function and can show photoelectric emission with visible light.
Hence,
\[
\boxed{(C)\ \text{sodium}}
\]
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