Waves Flashcards

1
Q

speed of light

A

c=3.0 x 10^8

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2
Q

formula for the speed of sound in air

A

V=331.5+0.606T

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3
Q

frequency of a wave

A

f=v/λ

λ=wavelength

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4
Q

how far the medium moves from the rest position (where it is not moving)

A

Amplitude

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5
Q

the distnace between one point on a wave and the exact same place on the next wave

A

Wavelength (λ)

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6
Q

how many waves go past a point in one second

A

frequency (f)

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7
Q

measurement of frequency

A

Hertz (Hz)

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8
Q

waves in which the medium moves at right angles to teh direction of the way

A

transverse waves

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9
Q

the highest point in the wave

A

crest

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10
Q

the lowest point in the wave

A

trough

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11
Q

waves in which the medium moves back and forth in the same direction as the wave

A

Compressional (longitudinal) waves

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12
Q

where the particales are close together

A

compression

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13
Q

where the paricles are spread apart

A

rarefraction

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14
Q

higher frequency; smaller wavelength

A

higher pitch

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15
Q

There is an INCREASE in frequency for observers in which the source is moving toward them

A

higher pitch

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16
Q

There is a DECREASE in frequency for observers in which the source is moving away from them

A

Lower pitch

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17
Q

doppler effect formula

A

F-observer = [(V-sound+- V-observer)/(V-sound+-V-source)]F-true

18
Q

where is the speed of sound slowest?

19
Q

where is the speed of sound faster?

A

in liquids

20
Q

Where is the speed of sound fastest?

21
Q

between what two frequencies can the human ear hear?

A

20 Hz and 20,000 Hz

22
Q

What are frequencies that are higher than 20,000 Hz called?

A

Ultrasonic waves

23
Q

What are frequencies that are lower than 20 Hz called?

A

Infrasonic waves

24
Q

the denser the medium, the _______ the speed of light

25
what is the spreading of light around an obstacle?
Diffraction
26
What are waves that add together to create a larger wave?
Constructive interference
27
What is it called when troughs and crests overlaps "canceling one another"?
Destructive interference
28
What is it called when light passes from one medium to another?
Refraction
29
What happens when two waves overlap with each other?
Wave interference
30
What is the energy the metal exerts to hold onto its electrons?
Work function
31
Formula for light
E=hf
32
Energy of the light in Joules
E
33
planck's constant (h)
6.63*10^-34 J*sec
34
energy of a photon is measure in _____________
Electron volts (eV)
35
Electron Volts formula
1.000eV=1.602*10^-19 J
36
Planck's constant in eV
4.14*10^-15 eV*sec
37
Light comes from EM bundles or packets called what?
photons
38
What flies off the surface of a metal when the light is shined on the metal
photoelectrons
39
What are oscillating elctricle and magnetic fields?
Electromagnetic waves
40
Electromagnetic waves
EM