JEE Main & Advanced Physics Photo Electric Effect, X- Rays & Matter Waves Question Bank Assertion and Reason

  • question_answer
    Assertion             :       Mass of moving photon varies inversely as the wavelength. Reason                 :       Energy of the particle \[=\text{ Mass }\times \text{ (Speed of light}{{\text{)}}^{\text{2}}}\] [AIIMS 2000]

    A)             If both assertion and reason are true and the reason is the correct explanation of the assertion.

    B)             If both assertion and reason are true but reason is not the correct explanation of the assertion.

    C)             If assertion is true but reason is false.

    D)             If the assertion and reason both are false.

    E)             If assertion is false but reason is true.

    Correct Answer: B

    Solution :

                Mass of moving photon    \[m=\frac{h\nu }{{{c}^{2}}}=\frac{h}{c\lambda }\] and \[E=m{{c}^{2}}\].


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