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7) Calculate the energy of the photon emitted when a hydrogen atom undergoes a spin-flip transition....

7) Calculate the energy of the photon emitted when a hydrogen atom undergoes a spin-flip transition. How many such photons would it take to equal the energy of a single photon of wavelength 656.3 nm emitted by hydrogen (level 3 – level 2 transition)?

8) Suppose you discovered a star made purely of hydrogen and helium. How old do you think it would be? Explain your reasoning.

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