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प्रश्न
A proton and an α-particle enter a uniform magnetic field perpendicularly with the same speed. If the proton takes 25 µ seconds to make 5 revolutions, then the time period for the α-particle would be:
पर्याय
50 µ sec
25 µ sec
10 µ sec
5 µ sec
MCQ
उत्तर
10 µ sec
Explanation:
Time is taken by proton to make one revolution
= `25/5`
= 5 µ sec
As T = `(2π"m")/"qB"`; so `"T"_2/"T"_1 = "m"_2/"m"_1 xx "q"_1/"q"_2`
or T2 = `"T"_1 ("m"_2"q"_1)/("m"_1"q"_2)`
= `(5 xx 4 "m"_1)/"m"_1 xx "q"/(2"q")`
= 10 µ sec
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