Radiation

The spectrum of thermal radiation contains:

The intensity of radiation near a given wavelength is plotted against the wavelength for different temperatures. The peak of the curve is shifted in negative $X-\mathrm{direction}$ along the axis of wavelength with the increase in temperature.

List the gases responsible for the greenhouse effect.

The greenhouse effect is caused by Accumulation of $C{O}_2$  in the atmosphere

Sun's radiant energy is utilized by

The Radiant energy of the sun results from _____.

A spherical body of area $A$ and emissivity $e=0.6$ is kept inside a perfectly black body. Energy radiated per second by the body at temperature $T$ is

The wavelength of maximum intensity for emitted radiation from a source is $11\times {10}^{-5} \mathrm{cm}$.  The temperature of this source is $n$ times the temperature of some other source for which the wavelength at maximum intensity is known to be $5.5\times {10}^{-5} \mathrm{cm}$. Find the value of $n$.

The walls of a thermos flask is painted with silvery paint in order to avoid heat transfer by the process of radiation. 

In a thermos flask, the transfer of heat does not occur through the process of -

Which of the following statement is correct

Thermos flask is used to prevent heat loss due to 

The silvered surface in thermos flask will reduce heat lose by _____.

What is  the Green house effect?

Among the gasses which are considered as greenhouse gas.

No medium is required for transfer of heat by the process of thermal _____.

Three large identical plates are kept parallel to each other. The outer two plates are maintained at temperatures $T$ and $2T$, respectively. The temperature of the middle plate in steady state will be close to

A black body is defined as a perfect absorber of radiations. It may or may not be a perfect emitter of radiations.

$\mathrm{A}$ steady current is passing through a cylindrical conductor of radius $r$ placed in vacuum. Assuming Stefan'$\mathrm{s}$ law of radiation, steady temperature will be proportional to

Three very large plates of same area are kept parallel and close to each other. They are considered as ideal black surfaces and have very high thermal conductivity. First and third plates are maintained at absolute temperatures $2 \mathrm{T}$ and $3 \mathrm{T}$ respectively. Temperature of the middle plate in steady state is