Home
Class 11
PHYSICS
A very small hole in an electric furnanc...

A very small hole in an electric furnance is used for heating metals . The hole nearly acts as a black body . The area of the hole is `200 mm^(2)`. To keep a metal at `727^@C` , heat energy flowing through this hole per sec, in joules is (`sigma= 5.67 xx 10^(-8)Wm^(-2)K^(-4)`)

A

22.68

B

2.268

C

1.135

D

11.34

Text Solution

Verified by Experts

The correct Answer is:
D
Promotional Banner

Similar Questions

Explore conceptually related problems

The power of a black body at temperature 200K is 544 watt. Its surface area is (sigma = 5.67 xx 10^(-8) wm^(-2) K^(-4))

The surface of a black body is at a temperature 727^(@)C and its cross-section is 1 m^(2) . Heat radiated from this surface in one minute in joules is (Stefan's constant = 5.7 xx 10^(-8) W//m^(2) // k^(4) )

A body having a surface area of 5.0" cm"^(2) , radiates 300 J of energy per minute at a temperature of 727^(@)C . The emissivity of the body is (Stefan.s constant =5.67xx10^(-8)W//m^(2)//K^(4) )