A photon of wavelength lamda collides with an electron at rest. Which of the fol

Question

A photon of wavelength lamda collides with an electron at rest. Which of the following is true about the collision? I. The photon wavelength after the collision is less than before. II. The photon kinetic energy after the collision is less than before. III. The photon frequency after the collision is less than before.
Choose one answer.
a. I only
b. II only
c. III only
d. I and II only
e. II and III only

I'm pretty sure e is wrong


Also, please help with this one

An electron makes an energy level transition from -13.6 eV to -3.4 eV. What is the energy of the photon absorbed for this transition?
Choose one answer.
a. 3.4 eV
b. 10.2 eV
c. 13.6 eV
d. 17.0 eV
e. 20.2 eV

Explanation / Answer

e. II and III only




b. 10.2 eV

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