chapter 4 electromagnetic energy

this is the smallest quantity of any electromagnetic radiation. this is also not a particle like electrons of protons it is pure energy until it interacts. has no mass and no identifiable form.

photon

photon energy is an ______ _____ meaning it has a wide range of energy

energy continuum

a photon is a small bundle of energy sometimes called a ______

quantum

4 properties of photons

velocity

amplitude

wavelength

frequency

the velocity of all electromagnetic radiation is ________ m/s or ___x____

186,000 m/s or 3 × 10^8 m/s

although photons have no mass and no identifiable form they do have _____ and ____ fields

electric and magnetic fields

electric and magnetic fields move in a ______ fashion

sinusoidal

this is variations in amplitude over time

Sine waves

this is one half the range from crest to valley over which sine waves vary

amplitude

this is represented by lambda. it is the distance from one crest to another, one valley to another, or from any point on the sine wave. measure in meters. if this is shorter it means you have a higher frequency.

wavelength

compared to visible light x-rays have a _____ wavelength and _____ frequency

short, higher

this is measured in Hertz (Hz) it is the number of wavelengths that pass a point of observation per second. or the rise and fall. so 60 Hz is 60 cycles per second.

frequency

at a given velocity wavelength and frequency are _____ related

inversely

given 40 Hz how long will it take for once cycle?

.025 seconds (1/40)

what is the wave equation?

V=Frequency x wavelength (V=Fλ)

since the velocity of electromagnetic energy is constant we can simply the wave formula to

c=Fλ (c being the speed of light)