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Assertion : Photoelectric effect is mos...

Assertion : Photoelectric effect is most readily shown by ceasium metal.
Reason : Photon have easiest access to the surface of ceasium metal .

A

if both assertion and reason are correct and reason is correct explanation for assertion .

B

If both assertion and reason are correct but reason in not correct explanation for assertion.

C

If assertion is correct but reason is incorrect.

D

If both assertion and reason are incorrect.

Text Solution

Verified by Experts

The correct Answer is:
C
Correct reason. In ceasium, the electrons are most loosely held on the surface of the atom due to very small ionisation energy.
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Knowledge Check

  • Assertion : Photoelectric effect supports the quantum nature of light. Reason : Photoelectric emission is instantaneous.

    A
    If both assertion and reason are true and reason is the correct explanation of assertion.
    B
    If both assertion and reason are true but reason is not the correct explanation of assertion.
    C
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    D
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  • Statement-1: Photoelectric effect is easily pronounced by caesium metal. Statement-2: Photoelectric effect is easily pronounced by the metals having high ionization energy.

    A
    Statement-1 is true, statement-2 is true, statement-2 is a correct explanation for statement-1
    B
    Statement-1 is true, statement-2 is true, statement-2 is not a correct explanation for statement-1
    C
    Statement-1 is true, statement-2 is false.
    D
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  • Assertion: Photoelectric effect proves the particle nature of light. Reason: Photoemission starts as soon as light is incident on the metal surface, provided frequency of incident light is greater than or equal to the threshold frequency.

    A
    If both Assertion and Reason are true and the Reason is correct explanation of the Assertion.
    B
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    D
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