16.4 Exercise 7

A microscopic spherical dust particle of radius $2 \mu\text{m}$ and mass $10 \mu\text{g}$ is moving in outer space at a constant speed of 30 cm/sec. A wave of light strikes it from the opposite direction of its motion and gets absorbed. Assuming the particle accelerates opposite to the motion uniformly to zero speed in one second, what is the average electric field amplitude in the light?