Which of the following particles will have minimum frequency of revolution when projected with the same velocity perpendicular to a magnetic field?
(a) Electron
(b) Proton
(c) He+
(d) Li+
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Answer:
He+
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(d) Li+ will have the maximum revolution frequency when projected with same velocity perpendicular to a magnetic field.
Explanation:
- It is to be observed that the time taken for the particle to complete one revolution is:
- T = 2πmqBAs frequency. This is the time period reciprocal. So, f = qB2πm.
- All the four particles will have the same charge. The mass is maximum for Li+. Therefore, it is to be noted that it will have smallest revolution frequency.
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