A photon of wavelength 
collides with an isolated stationary electron, as illustrated in the figure below.
The photon is deflected elastically by the electron. The wavelength of the deflected photon is 
.
On the figure above, draw an arrow to indicate the approximate direction of motion of the deflected electron.
Calculate:
the momentum of the deflected photon
the energy transferred to the deflected electron.
Another photon of wavelength collides with an isolated stationary electron. Explain why it is not possible for the deflected photon to have a wavelength less than .
.
.
