First slide

Radiation

Question

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

Moderate

A

450
B

1000
C

1800
D

225

Solution

P is directly proportional to $r^{2} T^{4}$
$\Rightarrow \frac{P_{1}}{P_{2}} = {(\frac{r_{1}}{r_{2}})}^{2} {(\frac{T_{1}}{T_{2}})}^{4}$
$P_{2} = 1800 watt$

Get Instant Solutions

When in doubt download our app. Now available Google Play Store- Doubts App

Recieve an sms with download link

Doubts App

OR

SCAN ME

Doubts App

Doubts App