The electromagnetic spectrum Flashcards
What are EM waves made up of?
time-varying electric and magnetic fields
what do EM waves carry?
they carry energy
What do they exert?
they exert forces on charged particles they impinge upon
what are they produced by?
they are produced by accelerating charge distributions
How is the frequency of an EM wave determined?
This is determined by the frequency of a source wave
what is a monochromatic wave?
a monochromatic wave is when a wave has a single frequency
What is a polychromatic wave?
A polychromatic wave is when the wave has many frequencies
What is spectrum radiation?
This is the distribution of energy among various constituent waves
common units for wavelength are..?
Angstrom, Nanometre and Micrometre
EM spectrum is generally displayed in terms of what?
frequency and wavelength
Radiometry is what?
the science of measurement of an EM wave
radiometric quantities characterize what?
they characterize the energy content of radiation
Radiant energy unit is?
Joules (J)
Radiant energy density unit is?
Jm^-3
Radiant flux or radiant power unit is?
W
