Infrared heats a body but UV heats less

[Multiverse]

Infrared heats a body but UV heats less!

If we consider two bodies of indentical properties (and temperature) and we apply radiation on them with different EM wave ,One with Infrared and the other with UV ray,we find that the body exposed by IR has more temperature increase with respect to other...
The Problem is UV has higher freqency and thus have more energy having same intensity ,so it should heat more.

 

[neyzenyelda]

IR heats. UV burns.

 

[mfb]

With the same intensity, the UV light has fewer photons, as the energy per photon is higher and intensity is usually defined as energy per time per area.

Without any knowledge about your body, it is impossible to say which photons heat it more.

 

[magic9mushroo]

If we consider two bodies of indentical properties (and temperature) and we apply radiation on them with different EM wave ,One with Infrared and the other with UV ray,we find that the body exposed by IR has more temperature increase with respect to other...
The Problem is UV has higher freqency and thus have more energy having same intensity ,so it should heat more.

Same intensity =/= same number of photons. Same intensity = same total energy.

So, your body absorbs IR more than UV, and thus is heated more by the IR than the UV. There is no issue here.

(If, on the other hand, it absorbed more UV than IR, it would be heated more by the UV.)

 

[sardar]

However, this is not always the case. Infrared radiation has longer wavelengths compared to UV radiation, which means it has lower energy. This lower energy is actually more efficient in heating objects because it can penetrate deeper into the body and cause the molecules to vibrate and generate heat.

On the other hand, UV radiation has higher energy and shorter wavelengths, which means it is more easily absorbed by the outer layers of the body and does not penetrate as deeply. This results in less heating of the body.

Additionally, the human body has a natural defense mechanism against UV radiation in the form of melanin, which absorbs and dissipates the UV energy. This further reduces the amount of heating from UV radiation.

In summary, while UV radiation may have higher energy, it is not as effective in heating bodies compared to infrared radiation due to its shorter wavelengths and the body's natural defenses. This is why we often feel warmer in the sun when exposed to infrared radiation, even though the sun emits a significant amount of UV radiation as well.