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Q.

Two spheres P and Q, of same colour having radii B cm and 2 cm are maintained at temperature 127°C and 527°C respectively. The ratio of energy radiated by P and Q is

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a

0.054

b

0.0034

c

1

d

2

answer is C.

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Detailed Solution

Q∝T4r2∴ Q1Q2=T14r12T24r22=(400)4×(0⋅08)2(800)4×(0⋅02)2=1
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