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Standard X
Physics
Properties of Alpha, Beta and Gamma Radiations
1012α-particl...
Question
10
12
α
-particles (nuclei of helium) fall per second on a neutral sphere; calculate the time in which the sphere gets charged by
2
μ
C
.
A
10 s
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B
6.25 s
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C
5 s
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D
62.5 s
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Solution
The correct option is
B
6.25 s
Total charge required
Q
=
2
μ
C
=
2
×
10
−
6
C
Charge of one
α
particle
q
=
2
e
=
2
×
1.6
×
10
−
19
C
Charge accumulated per second
Q
′
=
10
12
×
2
×
1.6
×
10
−
19
C
So, time taken
t
=
Q
Q
′
=
2
×
10
−
6
10
12
×
2
×
1.6
×
10
−
19
=
6.25
s
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