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An X-ray photon of wavelength 6 pm (1 pm = 10^-12 m) makes a head-on collision with an electron, so that the scattered photon goes in a direction opposite to that of the incident photon

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An X-ray photon of wavelength 6 pm (1 pm = 10^-12 m) makes a head-on collision with an electron, so that the scattered photon goes in a direction opposite to that of the incident photon. The electron is initially at rest.

(a) How much longer is the wavelength of the scattered photon than that of the incident photon?

(b) What is the kinetic energy of the recoiling electron? (Use the conservation of energy)