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Assertion The specific charge of canal rays is not constant. Reason The mass of ion varies with speed.

1. Assertion is correct but Reason is wrong.
2. Assertion is wrong but Reason is correct.
3. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
4. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

Correct answer: Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.

Solution

Canal rays are streams of positive ions, and their specific charge depends on the ion’s charge and mass. Since the mass of an ion can vary with its speed, the charge-to-mass ratio is not fixed, so both statements are correct and the reason explains the assertion.

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