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The type of radiation emitted depends on the temperature of the body. Hot bodies emit a continuous range of electromagnetic radiation at different energy values – this means that the radiation that is emitted is spread out over a range of different frequencies and wavelengths.

Why do objects emit different wavelengths of electromagnetic radiation?

The amount of electromagnetic radiation an object emits depends primarily on its temperature. The higher the temperature of an object, the faster its electrons vibrate and the shorter its peak wavelength of emitted radiation.

How do all objects emit electromagnetic waves?

All objects emit electromagnetic radiation according to their temperature. Colder objects emit waves with very low frequency (such as radio or microwaves), while hot objects emit visible light or even ultraviolet and higher frequencies.

Why do objects release radiation?

Thermal radiation is generated when heat from the movement of charges in the material (electrons and protons in common forms of matter) is converted to electromagnetic radiation. All matter with a temperature greater than absolute zero emits thermal radiation.

What emits electromagnetic radiation?

Electromagnetic radiation is produced whenever a charged particle, such as an electron, changes its velocity—i.e., whenever it is accelerated or decelerated. The energy of the electromagnetic radiation thus produced comes from the charged particle and is therefore lost by it.

What do different wavelengths tell us?

Some objects emit across a range of wavelengths, each revealing a different aspect of their composition and behaviour. Other objects are completely invisible at one wavelength, yet are clearly visible at another. Observing across the whole spectrum gives us a much better picture of our Universe.

Why do hotter objects emit shorter wavelengths?

Since atoms in hotter objects have more energy, they can emit photons with more energy than cooler objects can. (When an atom emits a photon the photon energy comes from the atom, so an atom can't emit a photon with more energy than the atom had.) So hot objects emit high energy photons, or short wavelength light.

Why do some objects emit more radiation than others?

Electromagnetic radiation is continually being "exchanged" among objects. Objects that are warmer emit more energetic radiation than those that are cooler and so they cool faster. Therefore, in the absence of an external heat source, all objects in a confined space will eventually reach the same temperature.

Why do Blackbodies emit all wavelengths?

A blackbody allows all incident radiation to pass into it (no reflected energy) and internally absorbs all the incident radiation (no energy transmitted through the body). This is true for radiation of all wavelengths and for all angles of incidence. Hence the blackbody is a perfect absorber for all incident radiation.

Do all objects emit and absorb electromagnetic radiation?

All bodies (objects) emit and absorb types of electromagnetic radiation. They do this regardless of their temperature . The intensity of radiation increases as the body gets hotter and gives out more radiation in a given time. The type of radiation emitted also changes with temperature.