1.

Assertion: K and Cs are sued in photoelectrical cells. Reason: K and Cs emit electrons on exposure to light.

Answer»

if both assertion and reason are TRUE and the reason is the CORRECT explanation of the assertion.
If both assertion and reason are true but reason is not the correct explanation of the assertion.
If assertion is true but reason is false
If the assertion and reason both are false.

Solution :K and Cs emit electrons on EXPOSURE to light hence, both are used in photoelectric cells. Here, assertion and reason are true and reason is a correct explanation.


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