4.222. A free electron is located in the field of a plane electromagnetic wave. Neglecting the magnetic component of the wave disturbing
its motion, find the ratio of the mean energy radiated by the oscillating electron per unit time to the mean value of the energy flow
density of the incident wave.
4.223. A plane electromagnetic wave with frequency co falls upon
an elastically bonded electron whose natural frequency equals O.
Neglecting the damping of oscillations, find the ratio of the mean
energy dissipated by the electron per unit time to the mean value
of the energy flow density of the incident wave.
4.224. Assuming a particle to have the form of a ball and to absorb all incident light, find the radius of a particle for which its
gravitational attraction to the Sun is counterbalanced by the force
that light exerts on it. The power of light radiated by the Sun equals
P = 4.1026 W, and the density of the particle is p = 1.0 g/cms.