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KVPY SX SB Exam 05-Nov-2017 Question Paper
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© examsnet.com
Question : 21
Total: 120
Physics
The magnitude of acceleration of the electron in the n
th
orbit of hydrogen atom is
a
H
and that of singly ionized helium atom is
a
He
. The ratio
a
H
:
a
He
is
1 : 8
1 : 4
1 : 2
dependent on n
Validate
Solution:
r
∝
1
z
& v ∝ z
∴ according
(
v
2
r
)
∝
z
2
×
1
(
1
∕
z
)
=
z
3
a
H
a
He
=
(
z
H
z
He
)
3
=
(
1
2
)
3
=
1
8
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