Blackbody Radiation

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?

How is total emissivity calculated?

What is the emissivity value?

What is emissivity formula?

Why energy spectral density is important?

What is the formula for emissive power?

Is absorptive power and emissivity same?

What is the spectral absorptive power?

What is a transmitter antenna?

What is smart transmitter?

How do transmitters work?

Sun's radiant energy is utilized by

Which of the following statement is correct

A good absorber is

Find the amount of energy transmitted, if $150 \mathrm{J}$ of energy is incident on area of $2 {\mathrm{m}}^2$. Given $Q_r= 15 \mathrm{J}$ and coefficient of absorption is $0.6$.

A piece of blue glass heated to a high temperature and a piece of red glass at room temperature are taken inside a dimly-lit room. Then,

The number of photons falling per second on a completely darkened plate to produce a force of $6.62\times {10}^{-5} N$ is $n$. If the wavelength of the light falling is $5\times {10}^{-7} \mathrm{m},$ then $n=\dots \times {10}^{22}.\left(h=6.62\times {10}^{-34}\mathrm{ J}-\mathrm{s}\right)$