Assertion : $K$ -shell electron capture is detected by analysing the wavelength of $X$ -ray emitted. Reason: The wavelength of the $X$ -ray is characteristic of the daughter element and not the parent element.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
K shell electron capture produces modified X-ray wavelengths.
Daughter element determines the X ray produced and so reason is correct.
But the reason does not state the relation to K shell electron capture.Hence option B is correct

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