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Waves > #1 > Flashcards

#1 Flashcards

1
Q

Waves

A

A traveling disturbance of coordinated vibrations that transmit energy with no net movement of the medium

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2
Q

Medium def

A

The substance a wave travels through (air, water, ground)

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3
Q

Electromagnetic waves do not need a what

A

Medium

IR, light, radio

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4
Q

Transverse wave def

A

Wave oscillation is perp. To the direction the wave travels

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5
Q

Longitudinal waves def

A

Oscillation is parallel to the drection of the wave

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6
Q

Frequency def

A

of waves that pass a point in a certain amount of time

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7
Q

Units are HZ when time is in

A

Seconds

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8
Q

Period def

A

Time for 1 wave to pass a certain point

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9
Q

Most waves are a combo of

A

Both types of waves

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10
Q

Wave speed def

A

Rate of movement of the disturbance, not the particles

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11
Q

Medium plays a role in

A

Speed

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12
Q

Larger particles moves

A

More slowly

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13
Q

Strength of force plays a role in

A

Speed

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14
Q

Waves in a gas

A

Depends on ratio pressure on gas to density of gas

- ratio depends on temp

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15
Q

Wave propagation def

A

Showing how waves move on paper

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16
Q

Wavelength model did

A

Almost gets straight the farther it goes out

17
Q

Ray model def

A

Energy is each wavefront or ray is equal

18
Q

You have what the farther you get out

A

Less space between the energy

19
Q

Reflection def

A

When a wave hits a boundary of the medium; or an abrupt change in the properties of the medium

20
Q

Doppler effect

A

An apparent change in frequency of a wave due to the motion of the source of receiver

21
Q

Sound frequency =

A

Pitch

22
Q

In a specific medium, all the waves

A

Are at the same rate

23
Q

Echolocation def

A

Using reflection of a wave to determine an objects location

24
Q

Examples of echolocation

A

Radar & sonar
Waves leave the source
Wave reflects off object
& wave returns to the source

25
Q

Since you know the speed the speed of the wave you can what

A

Calculate the distance the object is away

26
Q

Radar guns def

A

Tell speed by how waves frequency is shifted

27
Q

Diffraction def

A

The bending of a wave as it passes through an opening

If the wavelength is much smaller than the opening, very little diffraction.

28
Q

Interference def

A

When 2 or more waves occupy the same space at the same time

29
Q

Constructive interference

A

When 2 or more waves are in phase
Crests & trough line up
Add amplitudes together
Wavelength is unchanged

30
Q

Destructive interference def

A

2 or more waves are out of phase

Amplitudes are subtracted

Waves (2 decks)

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