A very small hole in an electric furnace...

A very small hole in an electric furnace is used for heating metals. The hole nearly acts as black body. The area of the hole is `200mm^(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))` .

22.68

2.268

1.134

11.34

Text Solution

Verified by Experts

The correct Answer is:

Topper's Solved these Questions

NTA NEET SET 38
NTA MOCK TESTS|Exercise PHYSICS|45 Videos
NTA NEET SET 40
NTA MOCK TESTS|Exercise PHYSICS|45 Videos

Similar Questions

Explore conceptually related problems

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

The surface area of a black body is 5xx10^(-4) m^(2) and its temperature is 727^@C . Energy radiated by it per minute is (Take sigma =5.67xx10^(-8) "J m"^(-2) s^(-1) K^(-4) )

The power of black body at temperature 200 K is 544 W .Its surface area is (sigma=5.67xx10^(-8)Wm^(-2)K^(-2))

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

A body which has a surface area 5.00 cm^(2) and a temperature of 727^(@)C radiated 300 j of energy each minute. What is the emissivity of body? Steafan's constant =5.67xx10^(-8) Wm^(-2) K^(-4) .

A cube, which may be regarded as a perfectly black body, radiates heat at the rate of 2770.2 watt when its temperature is 27^(@)C . The volume of the cube is (sigma=5.7xx10^(8)J//m^(2)" s "K^(4))

Calculate the temperature (in K) at which a perfect black body radiates energy at the rate of 5.67W cm^(-2) . Given sigma = 5.67 xx 10^(8)Wm^(-2)K^(-4) .

If the sun's surface radiates heat at 6.3 xx 10^(7) Wm^(-2) . Calculate the temperature of the sun assuming it to be a black body (sigma = 5.7 xx 10^(-8)Wm^(-2)K^(-4))

NTA MOCK TESTS-NTA NEET SET 39-PHYSICS

The escape Velocity from the earth is 11.2 Km//s. The escape Velocity ...
Text Solution
|
Two satellites are in the parking orbits around the earth. Mass of one...
Text Solution
|
A very small hole in an electric furnace is used for heating metals. T...
Text Solution
|
A gas is at 1 atm pressure with a volume 800 cm^(3). When 100 J of hea...
Text Solution
|
Which one of the following statement is true, in respect of the usual ...
Text Solution
|
Two particles , each of mass m and charge q, are attached to the two ...
Text Solution
|
A loop ABCD has current I = 10 A , as shown in the figure . AD and BC ...
Text Solution
|
A rod of length l is pivoted smoothly at O is resting on a block of he...
Text Solution
|
A ray of light travelling in the direction 1/2 (hati+sqrt(3)hatj) is i...
Text Solution
|
A uniform sphere of weight W and radius 3 m is being held by a frictio...
Text Solution
|
A block of mass m is in contact with the cart C as shown in The coeffi...
Text Solution
|
What is the difference between ""(92)"U"^(235) and ""(92)"U"^(238) ato...
Text Solution
|
In the options given below, let E denote the rest mass energy of a nuc...
Text Solution
|
The bob of a simple pendulum is a spherical hollow ball filled with wa...
Text Solution
|
Two springs of force constants k(1) and k(2), are connected to a mass ...
Text Solution
|
Surface of certain metal is first illuminated with light of wavelength...
Text Solution
|
A particle of mass M at rest decays into two particle of masses m1 and...
Text Solution
|
Two drops of the same radius are falling through air with a steady vel...
Text Solution
|
A cylindrical vessel of 100 cm height is kept filled upto the brim. It...
Text Solution
|
On a plane mirror, a ray of light is incident at an angle of 30^@ with...
Text Solution
|