Bohr predicted the radius of the orbit of the electron in the hydrogen atom to be: If the electron moves from n = 1 to n = 2, by how many times the radius of the orbit will increase?
Correct answer: B. 3 times
- A. 2 times
- B. 3 times
- C. 4 times
- D. 5 times
Explanation
Since r = n^2 (0.053nm) When n = 1 r1 = 0.053nm When n = 2 r2 = 2^2 (r1) r2 = 4 r1 An increase in the radius of orbit when an electron moves from n=1 to n=2 is given as 4r1 - r1 = 3r1 ( 3 times increase)
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The hydrogen spectrum consists of discrete emission lines produced when electrons fall between quantised energy levels and release photons. Questions use the Rydberg equation, photon energy and wavelength, and identify the Lyman, Balmer, Paschen, Brackett and Pfund series, which differ from continuous spectra.
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