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Byju's Answer
Standard IX
Physics
Earth, Moon and High Tide
The radius of...
Question
The radius of orbit of a planet is two times that of earth. The time period of planet is:
A
4.2
y
e
a
r
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B
2.8
y
e
a
r
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C
5.6
y
e
a
r
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D
8.4
y
e
a
r
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Solution
The correct option is
B
2.8
y
e
a
r
T
2
α
R
2
∴
(
T
1
T
2
)
2
=
(
R
1
R
2
)
3
∴
T
2
=
√
(
R
2
R
1
)
3
.
T
1
2
⇒
√
(
2
R
R
)
3
.1
∵
T
1
=
1
y
e
a
r
⇒
√
8
⇒
2.8
y
e
a
r
s
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