Three black bodies A, B and C in the form of cubes of sides in the ratio of 3: 4: 5 are kept at the same high temperature. The ratio of the quantity of heat lost per second by A, B and C will be
27: 64: 125
5: 4: 3
9: 16: 25
25: 16: 9
Additional Questions
|
A sphere, a cube and a thin circular plate all made of the same material and having the same mass are initially heated to a temperature of 300°C. which one of these cools faster? |
Answer |
|
A body cools from 60°C to 50°C in 10 minutes. If the room temperature is 25°C and assuming Newton’s law of cooling to hold good, the temperature of the body at the end of the next 10 minutes will be |
Answer |
|
The emissive of a perfectly black body is |
Answer |
|
The coefficient of transmission of a perfectly black body is |
Answer |
|
An extremely hot star would appear to be |
Answer |
|
When a black body is heated, it emits heat radiations of |
Answer |
|
A black body is at 300 K. It emits energy at a rate which is proportional to |
Answer |
|
An ideal black body is represented by |
Answer |
|
The coefficient of transmission and coefficient of reflection for a given body at a given temperature are 0.33 and 0.64 respectively. Then the coefficient of emission of the same body at the same temperature will be |
Answer |
|
If a black body is heated from 27°C to 927°C, then the ratio of the radiation emitted by the body at the two temperatures will be |
Answer |