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What is the wavelength (in nm) of the line in the spectrum of the hydrogen atom that arises from the transition of the electron from the orbital with n =5 to the orbital with n = 2?

Note, the line corresponds to the energy of the photon that is emitted in the transition.


Find the de Broglie wavelength (in nm) associated with an electron that is moving with a velocity of 5330 km/s. The electron rest mass is 9.11 x 10-31 kg.

Note, electrons having this speed would need to be treated as waves in atoms because the wavelength is on the order of the size of atoms.


Please help! I got these wrong for some reason.

  • chem -

    4.34 is right EXCEPT you left off the 10^-7 AND you didn't convert to nm as the problem asks.
    Do it again and see if you don't get 4.34E-7 m which = 4.34E-7 x (1E9 nm/1 m)=?

    For #2, 1.35E-10 is correct for meters. The problem asks for nm. You need to convert to nm.

  • oops--typo -

    1.3646E-10 which I would round to 1.36E-10.
    Also, note that 1.364 is too many significant figures; you're allowed only 3 places.

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