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35. When the electron in a hydrogen atom falls from its first excited energy level to...

35. When the electron in a hydrogen atom falls from its first excited energy level to the ground state energy level, a photon with wavelength l is emitted. A proton having this same wavelength would have a velocity of

a. 3.87 m/s.
b. 5990 m/s.
c. 1.21 ´ 10-7 m/s.
D. 3.26 m/s.
e. 5.99 m/s.

answer is D

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