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QNEET-2017-Ph-970: NEET 2017 Physics - Class 11 NEET-2017-Ph-970 Solution: A spherical black body with a radius of 12 cm radiates 450 watt …
A spherical black body with a radius of 12 cm radiates 450 watt power at 500 K. If the radius were halved and the temperature doubled the power radiated in watt would be 450 1000 1800 225
Multiple Choice Options
- A 450
- B 1000
- C 1800
- D 225
Step-by-Step Verified Solution
Given r 1 = 12 cm , r 2 = 6 cm
T 1 = 500 K and T 2 = 2 _ 500 = 1000 K
P 1 = 450 watt
Rate of power loss P _ r 2 T 4
P 1 P 2 = r 1 2 T 1 4 r 2 2 T 2 4
P 2 = P 1 r 1 2 T 1 4 r 2 2 T 2 4
Solving we get, P 2 = 1800 watt