Question: Electrons are accelerated from rest through a potential difference V . As V is decreased, the de Broglie wavelength of these electronsto excite an electron

Electrons are accelerated from rest through a potential difference V. As V is decreased, the de Broglie wavelength of these electronsto excite an electron from the gound state (n =1) to the second energy level (n =2). According to the Bohr model of the atom, to excite the electron to the third energy level (n =3) would require a photon with energy

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