All objects and living things emit infrared radiation unless the object is not a black hole as well unless its temperature is not at the Absolute Zero ( I would call it an "infrared black hole") - such an object can only absorb infrared radiation.
They emit a source of light
Warm bodies emit infrared radiation.
Heat.
The black body equation describes this in detail, it is called Plank's law. All bodies emit electromagnetic radiation. The hotter the body the higher the average frequency. Refer to the links in the Related links for lots of detail.
nopes, shorter. hot object will emit photons at high frequency (=blue flame for example, short WL) and cold object will emit photons at lower frequency (=IR for example which our bodies emit, long WL)
radioactive elements
Warm bodies emit infrared radiation.
Sun and stars .
Bodies which emit light are luminous bodies and those who don't emit light are known as non luminous bodies Example - stars are luminous bodies while planets are non luminous bodies Tube light is a luminous body while a chair is non luminous
Heat.
stars
There is a chemical in their bodies called luciferin. They mix it with several other chemicals and enzymes to create a reaction that puts out the yellow-green light you see.
Hotter bodies emit wavelengths which peak at the shorter end of the spectrum.
This is called homeostasis.
The black body equation describes this in detail, it is called Plank's law. All bodies emit electromagnetic radiation. The hotter the body the higher the average frequency. Refer to the links in the Related links for lots of detail.
nopes, shorter. hot object will emit photons at high frequency (=blue flame for example, short WL) and cold object will emit photons at lower frequency (=IR for example which our bodies emit, long WL)
Black holes are believed to emit something called Hawking radiation.
The solar system