Question

How E is positive????
For emission Spectra ni;nf

Answer 1

Answer:

You should understand that the energy change of the atom is positive for absorption (nf > ni) and is negative for emission (nf < ni). ... iii Evidence of quantized energy levels in matter comes from atomic emission spectra, in which photons are observed as electrons change from one orbital to another.

Answer 2

Explanation:

Solving for the wavelength of this light gives a value of 486.3 nm, which agrees with the experimental value of 486.1 nm for the blue line in the visible spectrum of the hydrogen atom.

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