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Byju's Answer
Standard XII
Physics
Finding Average Velocity
The ratio of ...
Question
The ratio of radii of first orbits of H,
H
e
+
and
L
i
2
+
is
A
1 : 2 : 3
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B
6 : 3 : 2
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C
1 : 4 : 9
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D
9 : 4 : 1
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Solution
The correct option is
B
6 : 3 : 2
r
=
n
2
2
×
0.529
˚
A
r
H
:
r
H
e
+
:
r
L
i
2
+
=
1
:
1
2
:
1
3
=
6
:
3
:
2
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