Q.

Two particles Y and Z emitted by a radioactive source at P made tracks in a chamber as illustrated in the figure.A magnetic field acts downward into the paper. Careful measurements showed that both tracks were circular, the radius of Y track being half that of the Z track. Which one of the following statements is certainly true?

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a

Both particles Y and Z carried a positive charge

b

The mass of particle Z was one-half that of particle Y

c

The mass of particle Z was twice that of particle Y

d

The charge of particle Z was twice that of particle Y

answer is A.

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Detailed Solution

It is clear from Right Palm Rule that the charges are positively charged.As   r=mvqBThe radius of path is not the only function of either m or q. For (2), (3) and (4) we cannot make clear statement, but statement (1) is certainly true.
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Two particles Y and Z emitted by a radioactive source at P made tracks in a chamber as illustrated in the figure.A magnetic field acts downward into the paper. Careful measurements showed that both tracks were circular, the radius of Y track being half that of the Z track. Which one of the following statements is certainly true?