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Prov '23 > Physics test Ch. 25 & 26 > Flashcards

Physics test Ch. 25 & 26 Flashcards

1
Q

3 things that go into us hearing sound?

A

We hear sound from the molecules bouncing, the eardrum receives it and sends signals to nerves through little hairs that are disturbed

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2
Q

What is the text book def. of vibrations?

A

A wiggle in time

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3
Q

What is the Law of the Pendelum?

A

Whatever the starting point, bc of the friction, air resistance, etc, the pendulum will never reach the original height again

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4
Q

What is the period of a wave?

A

Amount of time to get from the starting place, across, and back to the starting place

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5
Q

What is Simple Harmonic Motion?

A

Motion of going back and forth and back and forth and… Like a pendulum…when you hit a tuning fork and it shakes

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6
Q

What is the Amplitude of a wave?

A

Magnitude of the crest and trough (would be the same) (Max distance from 0)

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7
Q

What is the Wavelength? what is it measured in?

A

often in meters, from any two identical parts of the wave (Distance from one place to another)

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8
Q

What is Frequency? what is it measured in?

A

The number of vibrations in the given amount of time (how often it is going through its period) usually per second

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9
Q

List some electromagnetic waves

A

Electromagnetic Waves: Gamma, X, UV, and radio, all have different wavelengths and frequencies (measured in hertz)

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10
Q

what is the equation for wave speed?

A

Wave speed= wavelength x frequency

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11
Q

list in order of speed: air, metal, water

A

Fastest in metal, then water, and slowest in air

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12
Q

What is moving when a wave is being created?

A

The energy is what is actually moving

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13
Q

What is wave speed measured in?

A

m/s

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14
Q

Long wavelength = ____ frequency

A

low

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15
Q

fast wavelength=____ frequency

A

high

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16
Q

Can Transverse waves draw sine curves?

A

no

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17
Q

What motion makes a Longitudinal wave?

A

up and down in a straight line

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18
Q

Longitudinal wave is ________ to the direction of the wave

A

parallel

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19
Q

What is interference?

A

When waves begin to “get in touch” with each other

20
Q

What kind of interference amplifies the waves?

A

Constructive

21
Q

What kind of interference cancel each other out

A

destructive

22
Q

What is a standing wave?

A

Transverse waves where there is an attachment point at one end

23
Q

What is a node?

A

Point that never goes up or down in a standing wave

24
Q

More nodes=_______ frequency= ________ wavelength

A

higher, decreasing

25
Q

Antinodes: Point that _________

A

moves

26
Q

Doppler Effect:

A

Apparent change in frequency due to the location of the source compared to the receiver of that wave.

27
Q

What color shift does the universe have?

A

red

28
Q

What is a Bow wave?

A

when the object our races the wave (planes and boats)

29
Q

What shape is a shock wave?

A

A 3-dimensional wave

30
Q

All sounds are produced by ________

A

vibrations

31
Q

What determines pitch?

A

how the hairs in your ear vibrate

32
Q

Low pitch=______ frequency

A

low

33
Q

The range we can typically hear is between _____ (low pitch) and ________ (high pitch) hertz

A

20=20,000

34
Q

Infrasonic:

A

Less than 20 hertz (Too low to hear)

35
Q

Ultrasonic:

A

More than 20,000 hertz (Too high to hear)

36
Q

Can sound travel in space? light?

A

Sound no, light yes

37
Q

What is loudness measured in?

A

Decibels

38
Q

Amplitude:

A

The difference between the median and the top of the wave

39
Q

____________ measures how high a wave is reaching above the midpoint (in decibels)

A

Oscilloscope

40
Q

Forced vibration:

A

when you force a vibration onto another object, a tuning fork

41
Q

Everything has a natural frequency based on _______ & _______

A

shape and material

42
Q

Resonance:

A

forced vibration at the object’s natural frequency causes an increase in amplitude

43
Q

When at a concert, venues will sell certain seats for more because they sound better. What causes some seats to sound worse? (on the test)

A

dead spots

44
Q

Where did a bridge collapse from wind?

A

Tacoma, Washington

45
Q

__________ lost a bunch of soldiers when they marched over a bridge and it collapsed

A

Great Britain

46
Q

When a pebble is dropped it makes ___ waves usually

A

3

47
Q

Where does sound travel faster, LA or ATL? Why?

A

More moisture in the air in Atl makes it so sound travels faster here than in LA

Prov '23 (26 decks)

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