What does the red limit of the photoelectric effect depend on? It s confusing all the time 5

Happy New Year! Happy Chinese New Year!

1. I don't understand why the landlord uses the word red limit? What is Red Limit in English?

photoelectric effect = photoelectric effect;

Escape work = work funtion;

Cut-off frequency = threshold frequency.

What do you mean by red limit? Is it an analogy that your teacher made with concepts like redshift?

This is a very misleading statement, and teachers who are not clear about the concept and like to sell germination are often there.

There will be misleading analogies that are confused.

2. The essence of the photoelectric effect is:

a. The frequency of light determines whether the photoelectric effect can be generated;

b. Under the premise of reaching the frequency, the number of photons determines the strength of the photocurrent.

The stronger the photocurrent, the more photoelectrons, which is proportional.

3. Photoelectric effect, Compton effect, Rutherford scattering, 、、、 are all low-energy phenomena.

There are only a few institutions in China that have accelerators, but in fact, they are all low-energy accelerators, and they usually can't be surpassed at all.

10 million electron volts, the Institute of Theoretical Physics, is the study of low-energy physics rather than high-energy physics.

Usually you can't even type Gamma-Ray, you can only type X-Ray, and you have to use Proton Beam.

The photoelectric effect can be used in ordinary traffic lights, which is low-energy, medium-low energy, so why is the red limit?

Upstairs, the cut-off frequency is also known as the red limit frequency.

The frequency of the silver red line of the photo-reed electric effect depends on ():

a.The metal material escapes from the front collapse.

b.The intensity of the light.

c.The color of the light.

d.The frequency of light.

Correct Answer: The work of escape from a metallic material.

The lowest frequency at which light needs to be irradiated to produce the photoelectric effect is called the red limit frequency (i.e., cut-off frequency).

The photoelectric effect is an important and magical phenomenon in physics. Under the irradiation of electromagnetic waves higher than a certain frequency, the electrons inside some substances will be excited by photons to form an electric current, that is, photogenerated electricity.

In the photoelectric effect, the direction of electron emission is not completely key-oriented, but most of them are shot perpendicular to the metal surface, regardless of the direction of illumination. Light is an electromagnetic wave, but light is an orthogonal electromagnetic field with a high frequency **, and the amplitude is very small, so it will not affect the direction of electron ejection.

The photoelectric effect illustrates that light is particle-like. Correspondingly, the most typical examples of light having waves are interference and diffraction.

When the frequency of light is < 0, no matter how strong the light is used to irradiate the substance, it will not produce the photoelectric effect, according to the formula h = 1 2 m v v+a, 0 = a h , which is called the red limit. (also known as cut-off frequency).

A in the equation is the work of escape – a force within the surface layer of the metal that prevents the escape of electrons. If electrons are to be able to break free from the metal, they must overcome this obstacle and do their work. The minimum amount of work done to detach an electron from a metal is called the work of the metal.

The work of escape depends on the type of metal.

The so-called red limit refers to the limit frequency. It is thought that the frequency of light gradually increases from red to purple.

The photoelectric effect occurs when the frequency of light is greater than or equal to a certain limiting frequency. That is, light higher than this frequency (closer to the violet end than this light) can have a photoelectric effect.

Light with a lower frequency (i.e., closer to the red end) cannot undergo the photoelectric effect. Therefore, this limit frequency is called the limit near the red end. Abbreviated as Red Limit!

In the photoelectric effect, the minimum frequency of the photon that can cause the photoelectric effect to occur is the limiting frequency of the metal, also known as the limiting frequency or cut-off frequency.

In metals, the valence electrons in the outer shell of an atom will detach from the atom to which they belong and become free electrons that move thermally freely in the metal. However, when the temperature is not very high, the free electrons do not escape from the metal surface in large quantities, which indicates that there is a force in the metal surface that prevents the free electrons from escaping. In order for a free electron to break free, it must overcome this resistance to do work, which is called escape work, which is denoted by w0.

Since the energy of a photon is e=hv, the minimum value of the frequency at which the electron can escape is called the limiting frequency.