Consider the follwing characteristics of the photoelectric effect: The generatio
ID: 1563425 • Letter: C
Question
Consider the follwing characteristics of the photoelectric effect:
The generation of photoelectrons
The existence of a threshold frequency
The photoelectric current increases with increasing light intensity
The photoelectric current is independent of Delta V for Delta V > 0
The photoelectric current decreases slowly as Delta V becomes more negative
The stopping potential is independent of the light intensity
The photoelectron current appears instantly when the light is turned on.
Which of these cannot be explained by classical physics?
Consider the following characteristics of the photoelectric effect: photoelectric The generation of photoelectrons. ii. The existence of a threshold frequency. iii. The photoelectric current increases with increasing light intensity. iv. The photoelectric current is independent of Avfor AV 0. v. The photoelectric current decreases slowly as AV becomes more negative. vi. The stopping potential is independent of the light intensity. vii. The photoelectron current appears instantly when the light is turned on Which of these cannot be explained by classical physics?Explanation / Answer
The existence of a threshold frequency can not be explained by classical Physics. The reason is as follows:
When light shines on the surface of a metallic substance, electrons in the metal absorb the energy of the light and they can escape from the metal's surface. This is called the photoelectric effect, and it is used to produce the electric current that runs many solar-powered devices. Using the idea that light is a wave with the energy distributed evenly throughout the wave, classical physicists expected that when using very dim light, it would take some time for enough light energy to build up to eject an electron from a metallic surface. WRONG!! Experiments show that if light of a certain frequency can eject electrons from a metal, it makes no difference how dim the light is. There is never a time delay.
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