How do observations of the photoelectric effect conflict with the predictions of classical physics?
how do observations of the photoelectric effect conflict with the predictions of classical physics? yes, if it gained energy from a collision with the electron. for photon wavelength to decrease its frequency will increase and energy will increase. so the photon must gain energy from the collision with the electron.
How did observations of the photoelectric effect contradict the predictions of classical electromagnetic theory?
The photoelectric effect is the observation that many metals emit electrons when light falls upon them. Classical electromagnetic theory predicted that changing either the wavelength or the amplitude of the light would affect the emission of electrons.
What are the classical predictions about the photoelectric effect?
Based on the classical description of light as a wave, they made the following predictions: The kinetic energy of emitted photoelectrons should increase with the light amplitude. The rate of electron emission, which is proportional to the measured electric current, should increase as the light frequency is increased.
What experimental features of the photoelectric effect can be explained by classical physics?
It has three characteristics: (1) it is instantaneous, (2) it occurs only when the radiation is above a cut-off frequency, and (3) kinetic energies of photoelectrons at the surface do not depend of the intensity of radiation.
What are photons measured in?
Photon energy can be expressed using any unit of energy. Among the units commonly used to denote photon energy are the electronvolt (eV) and the joule (as well as its multiples, such as the microjoule).
Why does the photoelectric effect not support the wave model?
The photoelectric effect proves that energy is quantised. This means that energy arrives in ‘lumps’ known as quanta. These lumps or packets of energy are called photons. This contradicts the long accepted wave model, where light is considered as an electromagnetic wave, with energy arriving continuously.
Which of the following observations from the photoelectric effect is not a violation of classical physics?
Which of the following observations from the photoelectric effect is not a violation of classical physics? Electrons are ejected immediately after impact from light. Light can eject electrons from a semi-conductive material. Light intensity does not influence the kinetic energy of ejected electrons.
How does the photoelectric effect disagree with wave theory?
According to wave theory, after the light falls on a substance electrons are emitted after a small instant of time. However, in photoelectric effect, the electron emissions are immediate without a time delay.
What is the difference between the classical theory of light and the quantum theory?
The key difference between classical theory and quantum theory is that classical theory describes the nature of macroscopic level, whereas quantum theory describes the nature of microscopic level.
What is the photoelectric effect and what experimental evidence led scientists to discover it does this support the wave or particle theory of light Why?
The photoelectric effect was discovered in 1887 by the German physicist Heinrich Rudolf Hertz. In connection with work on radio waves, Hertz observed that, when ultraviolet light shines on two metal electrodes with a voltage applied across them, the light changes the voltage at which sparking takes place.
What makes quantum mechanics different from classical mechanics?
Quantum mechanics differs from classical physics in that energy, momentum, angular momentum, and other quantities of a bound system are restricted to discrete values (quantization), objects have characteristics of both particles and waves (wave-particle duality), and there are limits to how accurately the value of a …
How does a photon differ from a material particle?
In simple words: A photon has no rest mass and always travels with speed of light. A material particle has rest mass and never travels with speed of light.