How is work function related to threshold frequency?
How is work function related to threshold frequency?
The energy and frequency of a photon are related by: The minimum energy required to produce photo-emission of electrons is called the work function this depends on the type of metal used. The minimum frequency of light required to give the work function energy is called the threshold frequency.
What is the threshold frequency of copper?
9×1014Hz
What is photoelectric effect and its equation?
The Formula for Photoelectric Effect According to the famous Einstein explanation of the photoelectric effect: The energy of the photon will be sum total of energy needed to remove the electron and kinetic energy of the emitted electron. Thus h ν = W + E h \nu= W + E hν=W+E.
Why is wave theory of electromagnetic radiation not possible?
Wave theory of electromagnetic radiation is not able to explain the photoelectric effect because of three main drawbacks: But it was observed that the kinetic energy of the emitted electrons does not depend on the intensity whereas the magnitude of the photoelectric current increases with the frequency.
What is wave theory of light?
“The wave theory of light is the set of light as an electromagnetic wave. In this theory, light is represented as a spectrum of frequencies, some of which we can see (visible light) and some of which we can’t (ultraviolet and infrared light). Also see: Electromagnetic radiation”
Why can’t the photoelectric effect be explained by the wave model?
The photoelectric effect cannot be explained by the wave model due to the following reasons: The energy of a wave increases with an increase in intensity. However, in the photoelectric effect, increase in intensity has no effect on the energy of electrons emitted.
What is a quantum of light called?
Light quanta, called photons, are the smallest discrete amounts of light. For light quanta, we use the formula the energy of a photon = planck’s constant x frequency. So the way that we interpret is that the energy that’s present in electromagnetic waves is in these discreet packets called light quanta or photons.
What is classical wave theory?
According to the classical wave theory of light, the intensity of the light determines the amplitude of the wave, and so a greater light intensity should cause the electrons on the metal to oscillate more violently and to be ejected with a greater kinetic energy.
Why the photoelectric effect is not observed below the threshold frequency?
Light below a certain threshold frequency, no matter how intense, will not cause any electrons to be emitted. The explanation for the photoelectric effect goes like this: it takes a certain energy to eject an electron from a metal surface. This energy is known as the work function (W), which depends on the metal.