| ASSERTION: The ion cannot move with a speed beyond a certain limit in a cyclotron. |
| REASON: As velocity increases time taken by ion increases. |
A) If both assertion and reason are true and reason is the correct explanation of assertion.
B) If both assertion and reason are true and reason is not the correct explanation of assertion.
C) If assertion is true but reason is false.
D) If both assertion and reason are false.
E) If assertion is false but reason is true.
Correct Answer: A
Solution :
As velocity increases, the positive ion will take longer time to describe semi circular path to the time for half cycle of oscillating electric field. As a result of it the ion will not arrive in the gap between the two dees exactly at the instant, the polarity of the two dees is reversed and hence will not be accelerated further.
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