Which one of the following constants is related to radiation?
Gravitational constant
Planck’s constant
Critical constant
Boltzmann’s constant
Additional Questions
|
The temperature of a piece of metal is raised from 27°C to 51.2°C. the rate at which metal radiates energy increases nearly |
Answer |
|
If a black body is heated from 27°C to 927°C. then the ratio of radiation emitted will be |
Answer |
|
You are given a sphere, a cube and a thin circular plate, all made from copper and all having the same mass. If they are heated to a temperature of 200°C, then which are of them will cool fasted? |
Answer |
|
A body cools from 100°C to 70°C in 8 minutes. If the room temperature is 15°C and assuming Newton’s law of cooling holds good, then time required for the body to cool from 70°C to 40°C is |
Answer |
|
Heat energy received by the earth from the sun is due to |
Answer |
|
Two stars A and B radiate maximum energy at 3600Å and 3600Å respectively. Then the ratio of absolute temperatures of A and B is |
Answer |
|
In which process the rate of transfer of heat is maximum? |
Answer |
|
Solar radiation emitted by sun resembles that emitted by a black body at a temperature of 6000 K. maximum intensity is emitted at a wavelength of about 4800 Å. if the sun were cooled down from 6000 K to 3000 K, then the peak intensity would occur at a wavelength of |
Answer |
|
Emissivity of perfectly black body is |
Answer |
|
Absorptive power of perfectly black body is |
Answer |