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The spectral energy distribution of the microwave background radiation found in the universe is that of a perfectly absorbing body (blackbody) radiating at 2.70 Kelvin.
broadband blackbody radiation generated by heatnarrow band spectral radiation from excited electrons falling to lower energy atomic orbitals
from radiation and convection
The energy spectral density describes how the energy (or variance) of a signal or a time series is distributed with frequency.You can read more in Wikipedia 'Spectral Density', but you will need good maths to understand it!
P A. Apanasevich has written: 'Tables for the energy and photon distribution in equilibrium radiation spectra'
radioactivity
radiation light has energy and direction. Energy can be describe as having mass. E=mc2 Therefore all light can exert a pressure on objects dependent on its vector direction.
Mainly because not all of it is visible.
energy..
Radiation is electromagnetic energy and/or kinetic energy.
In simple terms, conduction, convection and radiation describe the three modes involved in the transformation of heat energy from one place to another.
beause you cant see certain gamma rays