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new Flashcards

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1
Q

Frequency

A

waves per second

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2
Q

Frequency measurement

A

Hertz(Hz)

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3
Q

wavelength

A

the length between one specific point in a wave and the same point in the next wave.

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4
Q

Vibration/ocillations

A

A repeated back-and-forth or up-and-down motion

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5
Q

Loudness

A

Human perception of sound intensity

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6
Q

Pitch

A

How high or low a sound is

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7
Q

what is pitch determined by

A

The number of vibrations per second or frequency determines the pitch of a sound. Frequency is directly proportional to pitch. Higher the frequency, the higher the pitch.

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8
Q

Vacuum

A

A space where no particles of matter exist

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9
Q

Decibel

A

a unit that compares the loudness of different sounds(dB)

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10
Q

range of frequencies a person can hear

A

20-20000Hz

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11
Q

What happens to a soundwave when you hear an echo?

A

The sound wave is reflected.

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12
Q

The unit to measure frequency

A

Hertz(Hz)

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13
Q

Which wave is fastest-light or sound?

A

Light

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14
Q

Which wave is fastest-light in air or light in water?

A

Light in air

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15
Q

Which wave is fastest-sound in air or sound in water?

A

Sound in water

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16
Q

Which material lets all light through?

A

Transparent.

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17
Q

Which material lets some light through?

A

Translucent

18
Q

Which material doesnt let any light through?

A

Opaque

19
Q

Low frequency =

High frequency =

A

low pitch

high pitch

20
Q

Loud =

Quiet =

A

large amplitude

small amplitude

21
Q

waves

A

Waves are oscillations or vibrations. All waves transfer energy.

22
Q

what happens to the matter around an on coming wave

A

The matter a wave passes through does not move from its position.

23
Q

Longitudinal waves

A

Longitudinal waves are oscillations that occur parallel to the direction of travel.

24
Q

what happens to particles in a longitudinal wave

A

In a longitudinal wave, the particles come close together and then push apart.

25
Q

what is it called when the particles are far apart

A

When the particles are far apart, this is called a rarefaction.

26
Q

what is it called when the particles are close together

A

When the particles are close together, this is called compression

27
Q

An example of a longitudinal wave

A

An example of a longitudinal wave is a sound wave.

28
Q

another name for longitudinal waves

A

Longitudinal waves are also called pressure waves.

29
Q

Transverse waves

A

Transverse waves occur when the oscillations are perpendicular or at right angles (90°) to the direction of travel.

30
Q

Examples of transverse

A

Examples of transverse waves include water waves and electromagnetic waves.

31
Q

wave speed calculation

A

Wave speed is calculated using the equation:
Wave speed = frequency × wavelength.
Wave speed is measured in m/s.

32
Q

Wavelength is measured in

A

metres (m)

33
Q

speed of light

A

Light travels at 300,000,000 m/s.

34
Q

speed of sound

A

Sound travels at 340 m/s in air.

35
Q

light

A

Travels as transverse waves.
Light is electromagnetic radiation.
Light can travel through a vacuum.
It takes about eight minutes for the Sun’s light to reach us traveling at 300,000,000 m/s.

36
Q

Law of reflection

A

The law of reflection states:
The angle of incidence equals the angle of reflection.
We are able to see objects as light reflects off objects into our eyes.
When reflection happens, it always follows the law of reflection

37
Q

distance equation

A

Distance = speed × time

38
Q

Peak or crest

A

the top of a wave.

39
Q

Trough

A

the bottom of a wave.

40
Q

Amplitude

A

the distance from the middle to the crest or trough of the wave.

physics light and sound (3 decks)

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