What are the three fundamental facts of the photoelectric effect that cannot be explained by the classical wave theory of light? 1. The photoelec...
1. The photoelectric effect is instantaneous. According to classical theory, if the light is extremely weak, there should be a measurable time interval between the instant the light begins to strike the metal and the emission of the electron. A time delay has never been measured.
2. The kinetic energy of the electrons does not depend on the intensity of the light. According to classical theory, increasing the intensity of the light would increase the energy.
3. Existence of a cutoff frequency or threshold frequency. For each metallic surface there is a characteristic cutoff frequency, such that for lower frequencies the photoelectric effect does not occur, no matter how intense the illumination. The classical theory says that the photoelectric effect will occur for any frequency.
1. The photoelectric effect is delayed. According to classical theory, if the light is extremely weak, there should be a measurable time interval between the instant the light begins to strike the metal and the emission of the electron. A time delay has been measured.
2. The kinetic energy of the electrons depends on the intensity of the light. According to classical theory, increasing the intensity of the light would increase the energy.
3. There is no cutoff frequency or threshold frequency. The classical theory says that the photoelectric effect will occur for any frequency.
1. The photoelectric effect is instantaneous. According to classical theory, if the light is extremely weak, there should be a measurable time interval between the instant the light begins to strike the metal and the emission of the electron. A time delay has never been measured.
2. The kinetic energy of the electrons does not depend on the intensity of the light. According to classical theory, increasing the intensity of the light would not increase the energy.
3. There is no cutoff frequency or threshold frequency. The classical theory says that the photoelectric effect will occur for any frequency.
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The three fundamental facts of the photoelectric effect that cannot be explained by the classical wave theory of light are: 1. The photoelectric effect is instantaneous. According to classical theory, if the light is extremely weak, there should be a measurable time interval between the instant the light begins to strike the metal and the emission of the electron. A time delay has never been measured. 2. The kinetic energy of the electrons does not depend on the intensity of the light. According to classical theory, increasing the intensity of the light would increase the energy. 3. There is a cutoff frequency or threshold frequency. For each metallic surface, there is a characteristic cutoff frequency, such that for lower frequencies the photoelectric effect does not occur, no matter how intense the illumination. The classical theory says that the photoelectric effect will occur for any frequency.
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