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Physics Review Question Unit: Waves Year: 1994 Question#: 48 Question: A metal surface emits photoelectrons when illuminated by green light.This surface must also emit photoelectrons when illuminated by (1 ) Blue light (2) Yellow light (3) Orange light (4) Red light . Explanation by: Jarrett SK [ Return to question menu ] Answer 1 Blue Light CORRECT This answer is correct. Blue light has more energy then green light. If green light causes this surface to emitt photoelectrons, then blue light certainly would. return to top Answer 2 Yellow light INCORRECT Yellow light has less energy then green light, and so we cannot be certain that yellow light would cause this surface to emitt photoelectrons. return to top Answer 3 orange light INCORRECT This answer is incorrect, because orange light has less energy than green light. We cannot be sure that orange light would cause this surface to emitt photoelectrons. return to top Answer 4 Red Light INCORRECT This answer is incorrect, because red light has less energy than green light. We cannot be sure that red light would cause this surface to emitt photoelectrons. return to top What's this question really asking? If green light causes this surface to give off photoelectrons, then which of these colors (having equal to or greater then the same energy level) must also cause this surface to emitt photoelectrons? return to top |
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