Assertion :Cyclotron is a device which is used to accelerate the positive ions. Reason: Cyclotron frequency depends upon the velocity.

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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Assertion is incorrect but Reason is correct

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Solution

The correct option is C Assertion is correct but Reason is incorrect
Cyclotron is suitable for accelerating heavy charged particles such as protons, -particles and positive ions. In a cyclotron, the positive ions cross again and again the same alternating (ratio frequency) electric field and thereby gain energy. It is achieved by making them to move along spiral circular paths under the action of a strong magnetic field. Cyclotron is also known as magnetic resonance accelerator. Cyclotron frequency is given by

$f = \frac{q B}{2 π m}$

As we can see, f does not depend on velocity of the charged particle.

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