1. In thermal equilibrium
2. At low temperature
3. At high temperature
4. None of these
In thermal equilibrium
1. With equal wavelength and temperature
2. In radio frequency range
3. In infrared range
4. All of these
With equal wavelength and temperature
1. Less than 1
2. Equal to 1
3. More than 1
4. None of these
Less than 1
1. Black body
2. White body
3. Grey body
4. Opaque body
Grey body
1. 0 and 0.1
2. -1 and +1
3. 0 and 1.0
4. None of these
0 and 1.0
1. 0 and 0
2. 1and 0
3. 0 and 1
4. 1 and 1
0 and 1
1. 0 and 0
2. 1and 0
3. 0 and 1
4. 1 and 1
1and 0
1. 0 and 0
2. 1and 0
3. 0 and 1
4. 1 and 1
0 and 0
1. Weans law
2. Stefan’s law
3. Kirchhoff’s law
4. Planck’s law
Weans law
1. Weans law
2. Stefan’s law
3. Kirchhoff’s law
4. Planck’s law
Kirchhoff’s law