How does infrared detect heat, and the relationship between heat and energy in infrared and ultravio

We should start with the definition of infrared: infrared is one of the many invisible rays of the sun's rays, discovered by the British scientist Hoxel in 1800, also known as infrared thermal radiation, he used a prism to decompose the sunlight, placed a thermometer in the position of the color band of various colors, and tried to measure the heating effect of various colors of light. It turned out that the thermometer on the outside of the red light warmed up the fastest.

Therefore, it is concluded that in the solar spectrum, there must be invisible light on the outside of the red light, which is infrared light. In the animal kingdom, there are many snakes with infrared detection ability, and their sensitivity can be sensed even by one thousandth of a degree, so scientists use this biomimetics to detect objects with heat sources, so objects with heat sources can only reduce the thermal effect in order to avoid being detected.

Solar radiation can be divided into three parts: ultraviolet, visible and infrared. Only infrared light can make a person feel the presence of heat directly.

The heat is exerted by infrared rays to exert its influence. The illumination, of course, corresponds to the visible part of the electromagnetic waves. It can be converted into infrared rays that make people feel the presence of heat.

But the light itself does not make the presence of heat directly felt.

Photon energy = h , h = joules · second, is Planck's constant;is the photon frequency. The higher the frequency of light, the greater the energy. Frequency and wavelength are inversely proportional, c (speed of light).

Ultraviolet rays have short wavelengths, high frequencies and high energy. If the wavelength of a beam of light is long, then the probability of collision and ejection in the process of propagating in a straight line is smaller, on the contrary, the wavelength is shorter, the easier it is to hit these particles and be ejected.

The sun continuously radiates energy into the universe in the form of electromagnetic waves, which is solar radiation. Therefore, solar radiation is an electromagnetic wave, and according to different wavelengths, solar radiation can be divided into three parts: ultraviolet ray, visible light, and infrared rays.

Each part has a corresponding energy (note that it is not heat). Energy can be converted into electricity, heat, etc. through different conversion methods. Heat can be converted into energy.

The amount of heat can reflect the level of energy. However, among all kinds of electromagnetic waves, only infrared rays can make people directly feel the presence of heat. The heat is exerted by infrared rays to exert its influence.

The illumination, of course, corresponds to the visible part of the electromagnetic waves. It can be converted into infrared rays that make people feel the presence of heat. But the light itself does not make the presence of heat directly felt.

For example, please rate it as "can be solved" Thank you!

Infrared.

To be precise, the "heat" is large because the wavelength of infrared rays is longer, and the size of human body cells is just close to this wavelength range. Physics shows that objects with similar wavelengths resonate when they are close together. And let us feel hot, and think that its "heat" is great, and ultraviolet light is because e=hv violet light frequency is greater than red light, so it has a lot of energy.

That is to say, infrared light is not hot, but the cells feel that it is hot, and the brain thinks it is hot.

Let's start by explaining how much heat should be.

Bai should belong to energy.

Even if it has a large calorie, but the other energy is small, the energy of the total dao is smaller than the energy capacity of ultraviolet rays, it is also possible, these two are not contradictory, and the reason for the large energy of ultraviolet rays is explained in addition, I don't know if you are a high school student, or? If you are a high school student, you should know that the energy of light is HV, and the energy of the frequency is large, so the energy of ultraviolet rays is large.

To be precise, the "heat" of infrared rays is large, to be precise, because the wavelength of infrared rays is longer, and the size of human body cells is just close to this wavelength range. Physics shows that objects with similar wavelengths resonate when they are close together. And let us feel hot, and think that its "heat" is large (note that it is not because of heat transfer that we heat, but think that it is hot, and that it is a figurative statement), and that heat is the amount of process, it is actually debatable to say that the heat of infrared is large.