Interaction of Thermal Radiation and Matter

A parallel beam of uniform, monochromatic light of wavelength $6600Å$ has an intensity of $900 \mathrm{W} {\mathrm{m}}^{-2}$. The number of photons in ${1 \mathrm{mm}}^3$ of this radiation are:

What is a spectrum of radiation?

Define energy density.

Define energy density.

What are the 7 types of electromagnetic spectrum radiation?

Why is energy density important in fuels?

What is energy density?

What is the energy density in electric field?

What is spectral energy density?

What does the spectral density tell us?

What is spectral density of radiation?

What is the difference between energy spectral density and power spectral density?

Why energy spectral density is important?

What is energy density write its formula?

The total emissive power of the emitter with area $\mathrm{dA}$ and temperature $\mathrm{T}$ is given by

The intensity of normal radiation ${\mathrm{I}}_{\mathrm{n}}$ is how much times the emissive power?

If ${\mathrm{I}}_{\mathrm{n}}$denotes the normal intensity and ${\mathrm{I}}_{\mathrm{\alpha }}$ represents the intensity at an angle $\mathrm{\alpha }$ then

In Raman effect, the spectral line with lower frequency than the incident frequency is

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.