it is believed that any object when hot radiate infra red rays so do humans radiate infrared rays when suffering from fever
2007-01-27 00:08:20 · 8 answers · asked by sneha r 2 in Science & Mathematics ➔ Biology
Yes, unless the ambient temperature is equal to or hotter than body temp.
2007-01-27 02:03:22 · answer #1 · answered by Dastardly 6 · 0⤊ 0⤋
Infrared is usually divided into 3 spectral regions: near, mid and far-infrared. The boundaries between the near, mid and far-infrared regions are not agreed upon and can vary. The main factor that determines which wavelengths are included in each of these three infrared regions is the type of detector technology used for gathering infrared light. Near-infrared observations have been made from ground based observatories since the 1960's. They are done in much the same way as visible light observations for wavelengths less than 1 micron, but require special infrared detectors beyond 1 micron. Mid and far-infrared observations can only be made by observatories which can get above our atmosphere. These observations require the use of special cooled detectors containing crystals like germanium whose electrical resistance is very sensitive to heat. Infrared radiation is emitted by any object that has a temperature (ie radiates heat). So, basically all celestial objects emit some infrared. The wavelength at which an object radiates most intensely depends on its temperature. In general, as the temperature of an object cools, it shows up more prominently at farther infrared wavelengths. This means that some infrared wavelengths are better suited for studying certain objects than others.
2016-03-29 04:52:53 · answer #2 · answered by Anonymous · 0⤊ 0⤋
humans don´t need to have a fever to be picked up by an infrared sensor. Their body temperature is enough. I only know about this because i´ve shot pictures with infrared film. The results are amazing, try it if you can. Humans´skin comes out as a very eerie light gray/white.
2007-01-27 00:19:12 · answer #3 · answered by No se 5 · 0⤊ 0⤋
yes humans do radiate infra red rays.
any warm object radiates ir rays
durin fever the wavelength of rays decreases as temp is inversely proportional to wavelength
2007-01-27 01:08:03 · answer #4 · answered by iron muncher 3 · 0⤊ 0⤋
Everything gives off infrared rays, regardless of its temperature. Even ice cubes do it.
The infrared spectrum covers a wide range of frequencies. The frequency of the infrared given off by a body is a function of its temperature. Our County health department uses an infrared scanner to measure the temperatures of hot and cold foods in restaurants, particularly cafeterias and salad bars. The scanner reads directly in temperature.
2007-01-27 07:06:20 · answer #5 · answered by Ed 6 · 0⤊ 0⤋
They radiate infra-red rays all the time when they are alive.
If a person has a fever their infra-red radiation signature intensifies.
2007-01-27 00:19:05 · answer #6 · answered by Billy Butthead 7 · 0⤊ 0⤋
I guess body heat is the emission of infra red.
IR cameras can pick up body heat.
2007-01-27 00:17:09 · answer #7 · answered by Norrie 7 · 0⤊ 0⤋
only when they are under intense heating,they do radiate infrared radiations
2007-01-27 00:17:41 · answer #8 · answered by niti 1 · 0⤊ 1⤋