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(a) An electron has a de Broglie wavelength of 2 pm. Calculate the relativistic velocity of...

(a) An electron has a de Broglie wavelength of 2 pm. Calculate the relativistic velocity of the electron in terms of c.

(b) A beam of 1.9 eV electrons bombards a sample of hydrogen. If a spectral line of the Balmer series is observed, calculate the initial energy level, n-i of the electron.

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