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Thirds - III Al - ACE > P1.2 Sound > Flashcards

P1.2 Sound Flashcards

1
Q

What do waves transfer?

A

Energy

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2
Q

What causes waves?

A

Oscillations or vibrations

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3
Q

What does frequency mean?

A

The number of waves per second

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4
Q

What is the unit for frequency?

A

Hz (Hertz)

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5
Q

What is a wavelength?

A

The distance from one point on a wave to the same point on the next wave?

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6
Q

What is the top of the wave called?

A

Peak or Crest

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7
Q

What is the bottom of the wave called?

A

Trough

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8
Q

What is the amplitude of the wave?

A

The distance from the middle to the top of the wave

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9
Q

What are the two types of wave?

A

Transverse and Longitudinal

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10
Q

What is a transverse wave?

A

A wave where the oscillations are 90 degrees to the direction of the wave

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11
Q

What is a longitudinal wave?

A

A wave where the oscillations are parallel to the direction of the wave

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12
Q

Is sound a longitudinal or transverse wave?

A

Longitudinal

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13
Q

What is a compression?

A

A part of the longitudinal wave where springs are close together

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14
Q

What is a rarefaction?

A

A part of the longitudinal wave where springs are far apart

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15
Q

What is meant by reflection

A

Where waves ‘bounce’ off a surface.

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16
Q

What is the technical term for when waves add together?

A

Superpose

17
Q

What do longitudinal waves require to travel?

A

A material or medium to travel though

18
Q

Can sound travel through a vacuum?

A

No

19
Q

What is the speed of sound in air?

A

340 m/s

20
Q

What is the speed of light?

A

300,000,000 m/s

21
Q

Can light travel through a vacuum?

A

Yes

22
Q

How can we ‘see’ sound waves?

A

Use an oscilliscope

23
Q

What happens when you increase the frequency of a sound wave?

A

It will be higher pitch

24
Q

What happens when you increase the amplitude of a sound wave?

A

It will be louder

25
Q

What range of frequencies can humans hear?

A

20 - 20,000 Hz

26
Q

How do we measure the loudness of a sound?

A

Using the decibel (dB) scale

27
Q

If a sound is 40 dB and then increasing loudness to 50 dB - how many times louder is the new sound?

A

10 times louder!

28
Q

What can you use to prevent damaging your ear drum?

A

Ear defenders

29
Q

What is an echo?

A

A reflected sound wave

30
Q

A sound wave is emitted, travels to a building, reflects and is then detected 5 seconds later. How far away is the building?

A

Total distance = speed x time = 340 m/s x 5 s = 1700 m. 1700 m is the distance to travel to the building AND back. So the building is 850 m away.

31
Q

What can ultrasound be used for?

A

Prenatal scans, echolocation

Thirds - III Al - ACE (6 decks)

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