Waves Flashcards
speed of light
c=3.0 x 10^8
formula for the speed of sound in air
V=331.5+0.606T
frequency of a wave
f=v/λ
λ=wavelength
how far the medium moves from the rest position (where it is not moving)
Amplitude
the distnace between one point on a wave and the exact same place on the next wave
Wavelength (λ)
how many waves go past a point in one second
frequency (f)
measurement of frequency
Hertz (Hz)
waves in which the medium moves at right angles to teh direction of the way
transverse waves
the highest point in the wave
crest
the lowest point in the wave
trough
waves in which the medium moves back and forth in the same direction as the wave
Compressional (longitudinal) waves
where the particales are close together
compression
where the paricles are spread apart
rarefraction
higher frequency; smaller wavelength
higher pitch
There is an INCREASE in frequency for observers in which the source is moving toward them
higher pitch
There is a DECREASE in frequency for observers in which the source is moving away from them
Lower pitch
doppler effect formula
F-observer = [(V-sound+- V-observer)/(V-sound+-V-source)]F-true
where is the speed of sound slowest?
in gases
where is the speed of sound faster?
in liquids
Where is the speed of sound fastest?
in Solids
between what two frequencies can the human ear hear?
20 Hz and 20,000 Hz
What are frequencies that are higher than 20,000 Hz called?
Ultrasonic waves
What are frequencies that are lower than 20 Hz called?
Infrasonic waves
the denser the medium, the _______ the speed of light
slower
what is the spreading of light around an obstacle?
Diffraction
What are waves that add together to create a larger wave?
Constructive interference
What is it called when troughs and crests overlaps “canceling one another”?
Destructive interference
What is it called when light passes from one medium to another?
Refraction
What happens when two waves overlap with each other?
Wave interference
What is the energy the metal exerts to hold onto its electrons?
Work function
Formula for light
E=hf
Energy of the light in Joules
E
planck’s constant (h)
6.6310^-34 Jsec
energy of a photon is measure in _____________
Electron volts (eV)
Electron Volts formula
1.000eV=1.602*10^-19 J
Planck’s constant in eV
4.1410^-15 eVsec
Light comes from EM bundles or packets called what?
photons
What flies off the surface of a metal when the light is shined on the metal
photoelectrons
What are oscillating elctricle and magnetic fields?
Electromagnetic waves
Electromagnetic waves
EM
