A photon of wavelength lamda collides with an electron atrest. Which of the foll

Question

A photon of wavelength lamda collides with an electron atrest. Which of the following is true about the collision? I. Thephoton wavelength after the collision is less than before. II. Thephoton kinetic energy after the collision is less than before. III.The photon frequency after the collision is less than before. I thought that I and II are true but I got it wrong. Can yougive me an explanation? Thank you!! A photon of wavelength lamda collides with an electron atrest. Which of the following is true about the collision? I. Thephoton wavelength after the collision is less than before. II. Thephoton kinetic energy after the collision is less than before. III.The photon frequency after the collision is less than before. I thought that I and II are true but I got it wrong. Can yougive me an explanation? Thank you!!

Explanation / Answer

a) the wavelength must be longer after the collisionbecause energy is conserved       and energy is imparted to theelectron = c / f   and E = h f       so if the photon losesenergy its wavelength increases and        (c) the frequency mustcorrespondingly decrease (b) as stated above energy is imparted to the electronand the photon losesenergy       

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