Rad 130 - electromagnetic energy part 1 slides 1-11
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22 Terms
photon
What would you call the smallest quantity of any type of electromagnetic radiation?
quantum
Photons could also be called what in older books?
energy
velocity is always 3x10^8 (speed of light)
Can photons exist at various velocity or energy?
electromagnetic field
What is the field around a photon called?
electric and magnetic
Photons are both ___ and ____
moving
Photons must be _____ to exist
sinusoidal / wave
Photons move it what fashion?
1 cycle, 2 pulses (crest + valley)
What is a sine wave?
crest +
valley -
Which part of the sine wave is positive and which is negative?
amplitude
frequency
wavelength
velocity (speed)
All waves have what measurable characteristics?
Height of a wave
1/2 range from crest to valley
What is amplitude?
A
Which has highest amplitude?
number of crests or valleys which pass per unit of time
What is frequency?
f
Frequency is represented by
Hertz (Hz)
What is the unit of measure for frequency?
1 cycle/second
1Hz =
40 cycles / 4 second =
10 cycles / 1 second =
10 Hz
If you count 40 crests in a 4 second period, what is the frequency?
60Hz = 60 cycles/sec
so each cycle is
1/60 sec
A current has a frequency of 60Hz
How long will it take for one cycle (1 complete movement of wave) to complete?
the distance from one crest to another (or valley to valley)
What is wavelength?
meters (m)
What is the unit of measurement for wavelenght?
λ (lambda)
What is the symbol for wavelength?
always inverse, if velocity is constant
higher frequency = lower wavelength
What is the relationship between wavelength and frequency?