Suppose an electron decelerated at a constant rate $$ from some initial velocity $0$ down to zero.

a$.$ What fraction of its initial kinetic energy is lost to radiation? $($The rest is absorbed by

whatever mechanism keeps the acceleration constant.$)$ Assume $0$ so that the Larmor

formula can be used.

b$.$ To get a sense of the numbers involved, suppose the initial velocity is thermal $($around $105$

m$/$s$)$ and the distance the electron goes is $30.$ What can you conclude about radiation

losses for the electrons in an ordinary conductor?