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1. Express your answer in scientific notation. An x-ray photon of initial frequency 1.7 × 1019...

1. Express your answer in scientific notation. An x-ray photon of initial frequency 1.7 × 1019 Hz collides with a free electron at rest; the scattered photon moves off at 106°. What is the frequency of the scattered photon (in Hz)?

2. What is the smallest energy photon that can be absorbed by a hydrogen atom in its fifth excited state (in eV)?

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