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The energy of a photon is 6.48 × 10^−25 J. What is its wavelength (in nanometers)?...

The energy of a photon is 6.48 × 10^−25 J. What is its wavelength (in nanometers)? Enter your answer in scientific notation.

What is the wavelength (in nanometers) of a photon emitted during a transition from

ni = 7 to nf = 2 state in the H atom?

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