Radiant energy from the sum arrives at Earth with an intensity of$\mathbf{1}\mathbf{.}\mathbf{5}\mathit{k}\mathit{w}\mathbf{/}{\mathit{m}}^{\mathbf{2}}$. Making the rough approximation that all photons are absorbed, find (a) the radiation pressure and (b) the total force experienced by Earth due to this “solar wind”.

A $\mathbf{0}\mathbf{.}\mathbf{065}\mathbf{}\mathit{n}\mathit{m}$ X-ray source is directed at a sample of carbon. Determine the minimum speed of scattered electrons.

At what wavelength does the human body emit the maximum electromagnetic radiation? Use Wien's law from Exercise 14 and assume a skin temperature of ${70}^{\circ }F$

Photons from space are bombarding your laboratory and smashing massive objects to pieces! Your detectors indicate that two fragments each of mass m₀ depart such a collision moving at 0.6c at 60^o to the photon’s original direction of motion. In terms of m₀ what are the energy of the cosmic ray photon and the mass M of the particle being struck (assumed stationary initially).

An X-ray source of unknown wavelength is directed at a carbon sample. An electron is scattered with a speed of $\mathbf{4}\mathbf{.}\mathbf{5}\mathbf{\times }{\mathbf{10}}^{\mathbf{7}}\mathit{m}\mathbf{/}\mathit{s}$ at an angle of. Determine the wavelength of the X-ray source.

Consider two separate objects of unequal temperature. What would you do with them and what would have to happen thereafter to enable them to reach the same common temperature? Use this idea to explain why the electromagnetic radiation enclosed in a cavity has a temperature that is the same as that of the cavity walls.