AIIMS 2002 Chemistry Photoelectric Cells Assertion Reason Question
Assertion : Potassium and caesium are used in photo-electric cells.
Reason : Potassium and caesium emit electrons on exposure to light.
If both the assertion and reason are true and the reason is a correct explanation of the assertion.
If both the assertion and reason are true but the reason is not a correct explanation of the assertion.
If the assertion is true but the reason is false.
If both the assertion and reason are false.
Correct Answer
Detailed Explanation
The valence shell electron in the alkali metals is so loosely held that even the low energy photons (light) can eject this electron from the metal surface.
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