What is the wavelength of light emitted when the electron in hydrogen atom undergoes transition from an energy level with n is equal to 42 and energy level n is equal to 2?
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Answer:
Rh=1.0977×10^7 per metre
1/wavelength=Rh(1/2^2. - 1/42^2)
wavelength= 441/110. ×Rh
= 4.009/Rh.. per metre
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Electrons are emitted with zero velocity from a metal surface when it is exposed to radiation of wavelength 6800 Å.
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