Home
Class 11
PHYSICS
The amount of the thermal radiations em...

The amount of the thermal radiations emitted from unit area of a perfectly black body in one second say E is related to the absolute temperature T of the body as :

A

`EpropT`

B

`E propT^(2)`

C

`EpropT^(3)`

D

`E propT^(4)`.

Text Solution

Verified by Experts

The correct Answer is:
D
`EpropT^(4)`.
Promotional Banner

Similar Questions

Explore conceptually related problems

Wiens Law (lambda_(m)) corresponding to which energy emitted per sec per unit area by a perfectly black body (surface) is maximum is inversly proportional to the absolute temp (T) of the black body . lambda_(m)prop(1)/(T)orlambda_(m)=(b)/(T) Where b is a constant of proportionality and is called Wein's constant b=2.898xx10^(-3)mK . Is the statement True?

According to Stefan's law of radiation, a black body radiates energy sigmaT^4 from its unit surface area every second where T is the surface temperature of the black body and sigma = 5.67 xx 10^-8 W//m^2 K^4 is known as Stefan's constant. A nuclear weapon may be thought of as a ball of radius 0.5 m. When detonated, it reaches temperature of 10^6 K and can be treated as a black body. Estimate the power it radiates

The acceleration fo a body in ms^-2 starting from rest varies with time in secnds as per the relation a = 3t + 4 then the magnitude of velocity of the body at t=2 s will be :

Explain why: An optical pyrometer (for measuring high temperature) calibrated for an ideal black body radiation gives too low value for the temperature of a red hot iron piece in the open, but gives a correct value for the temperature when the same piece is in the furnace.

If temperature of hot body is increased by 50% the amount of heat radiation emitted by the body would become nearly:

Explain why Two bodies at different temperatures T_1 and T_2 if brought in thermal contact do not necessarily settle to the mean temperature (T_1+T_2)//2 .

A body is released from a great height and falls freely towards the earth. Exactly one sec later another body is released. What is the distance between the two bodies 2 sec after the release of the second body ?