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NEET 2020 Model Question Paper 3
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© examsnet.com
Question : 24
Total: 180
If the temperature of the sun were to increase from T to 2T and its radius from R to 2R, then the ratio of the radiant energy received on earth to what it was previously will be
32
16
4
64
Validate
Solution:
E
=
σ
A
T
4
;
A
∝
R
2
∴
E
∝
R
2
T
4
∴
E
2
E
1
=
R
2
2
T
2
4
R
1
2
T
1
4
Put
R
2
=
2
R
,
R
1
=
R
;
T
2
=
2
T
,
T
1
=
T
⇒
E
2
E
1
=
(
2
R
)
2
(
2
T
)
4
R
2
T
4
=
64
© examsnet.com
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