calculate the maximum increase in photon wavelength that can occur during Compton Scattering. (answer in pm).

Answer 1

new lambda - old lambda = electron lambda (1-cos theta)

1-cos theta is max when theta = 180 degrees (cos theta = -1) and (1 -cos theta ) is two

electron wavelength is h/( me c)
= 2.43*10^-12 meters

so
4.86 * 10^-12 meters