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Sahay Sir > Question Answers > NCERT Exemplar Class 11 > Chemistry > Chapter 2 - Atomic Structure > What is the wavelength of light emitted when the electron in a hydrogen atom undergoes transition from an energy level with n = 4 to an energy level with n = 2? What is the colour corresponding to this wavelength ?

What is the wavelength of light emitted when the electron in a hydrogen atom undergoes transition from an energy level with n = 4 to an energy level with n = 2? What is the colour corresponding to this wavelength ?

What is the number of photons of light with wavelength 4000 pm which provide 1 Joule of energy ?