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Physics Review Question Unit: waves Year: 1989 Question#: 60 Question: The wavelength of photon A is greater than that of photon B. Compared to the energy of photon A, the energy of photon B is (1 ) less (2 ) greater (3 ) the same (4 ) What is this question really asking? Explanation by: Jill S. [ Return to question menu ] Answer 1 less INCORRECT This is the incorrect answer because the larger the wave length the less energy the wave needed to make the wave. So, the answer of less is wrong because then wave length B would be small but there would be less energy. That is impossible. return to top Answer 2 greater CORRECT The energy of a photon is less then the energy is greater. The energy of a photon is equal to the product of Planck's constant and its frequency. This is because the more energy put into the wave the small the wave length will be, because it takes less return to top Answer 3 the same INCORRECT If the answer was the same then the length of the wave A and B would also have to be the same. That though is not true. Wave A has a greater length therefore it has to use less energy the wave B. return to top What's this question really asking? What is the energy of wave B compared to wave A? return to top |
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