Question: A hydrogen atom, initially at rest, absorbs an ultraviolet photon with a wavelength of ( = 102.6 nm. What is the atom's final speed if

A hydrogen atom, initially at rest, absorbs an ultraviolet photon with a wavelength of ( = 102.6 nm. What is the atom's final speed if it now emits an identical photon in a direction that is

(a) Perpendicular or

(b) Opposite to the direction of motion of the original photon?

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