A perfect blackbody is the one that

reflects all incident radiation

transmits all incident radiation

both reflects and transmits incident radiation.

The conical projection in Fery’s blackbody is

used to prevent reflected radiation to escape outside

used to transmit incident radiation to outer sphere

used to prevent reflected radiation to escape outside

used for all of the above purposes.

the radiant energy emitted by the body per unit time per unit area of the body.

the energy emitted by the body in a given time

the radiant energy emitted by the body per unit area of the body

the radiant energy emitted by the body per unit time

the radiant energy emitted by the body per unit time per unit area of the body.

used to prevent reflected radiation to escape outside

the radiant energy emitted by the body per unit time per unit area of the body.

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10 Questions

The emissive power per wavelength interval $E _\lambda$ of a blackbody at an absolute temperature $T_{1}$ is maximum at $\lambda_1$ = 1.1 µm. At an absolute temperature $T_{2}$ , its $E_\lambda$ is maximum at $\lambda_2$ = 0.55 µm. Then, $\frac{T_1}{T_2}$ is equal to

The temperature of the photosphere of the Sun is about 6000 K. Wien’s displacement law constant is 2.898 × $10^{-3}$ m.K. The photosphere has maximum emissive power at wavelength

A sphere and a cube made of the same metal have equal volumes, identical surface characteristics and are at the same temperature. If they are allowed to cool in identical surroundings, the ratio of their rates of loss of heat will be

If the absolute temperature of a blackbody is increased by a factor 3, the energy radiated by it per unit time per unit area will increase by a factor of