All objects emit and absorb radiant energy?

Answer 1

Theoretically false. An object at the temp of absolute zero would emit no energy or radiation. However, absolute zero does not exist in nature (as far as we know), therefor, in a practical sense the statement is true.

Answer 2

With rare exceptions, all objects will both emit and absorb energy. There is a good correlation between the emissivity of a substance, and its absorption. A flat black surface will be both a good emitter and a good absorber of energy. A shiny surface will be poor for both emission and absorption.

But substances do not necessarily emit at the same wavelengths as they absorb. For example, when illuminated by white light, a red ball will only reflect the red wavelengths. All other wavelengths are absorbed. Light is a form of energy.

Answer 3

Depends on the radiation you are talking about:

• Hot objects emit blackbody spectrum electromagnetic radiation.
• Ionized gasses emit narrow line spectrum electromagnetic radiation.
• CRTs emit x-ray radiation.
• Radio sources emit electromagnetic radiation.
• Radioactive isotopes emit radioactivity (alpha, beta, gamma, neutron, etc.)
• etc.

Answer 4

They can do it either thermally as wideband blackbody radiation or as an antenna which may operate either narrowband or wideband or as very narrowband excited states.

Blackbody radiation/absorption is always omnidirectional.

Antenna radiation/absorption can be either omnidirectional or concentrated in one or more directional lobes depending on the structure of the antenna.

Excited state radiation/absorption can be either omnidirectional or highly unidirectional; if the excited state is a molecular vibrational or rotational state the radiation/absorption line can be anywhere in the radio frequencies, if the excited state is in the electron orbitals the radiation/absorption line can be anywhere from microwave frequencies to x-rays depending on the energy difference between the orbitals, if the excited state is in the nucleus the radiation/absorption line will be in gamma rays. MASERs and LASERs are highly unidirectional sources of electromagnetic radiation that make use of excited states.

Answer 5

Yes, all objects emit radiant energy in the form of infrared radiation based on their temperature, according to Planck’s law. They also absorb radiant energy when exposed to light, with different materials having varying absorption properties based on their composition and surface properties.

Answer 6

All objects emit electromagnetic radiation

Answer 7

Yes, it happens all the time. Objects on Earth get heated up by the Sun, and naturally they also emit electromagnetic radiation, according to their temperature.

Answer 8

the energy