Conceptual Challenge Problems
These rigorous, thought-provoking problems integrate conceptual learning with problem solving and are suitable for group work.
CP7.A (Section 7.2) Planck stated in 1900 that the energy of a single photon of electromagnetic radiation was directly proportional to the frequency of the radiation (E = hv). The constant h is known as Planck’s constant and has a value of 6.626 × 10-34 Js. Soon after Planck’s statement, Einstein proposed his famous equation (E = mc2), which states that the total energy in any system is equal to its mass times the speed of light squared.
According to the de Broglie relation, what is the apparent mass of a photon emitted by an electron undergoing a change from the second to the first energy level in a hydrogen atom? How does the photon mass compare with the mass of the electron (9.109 × 10-31 kg)?
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