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Year 8 science > Physics test 1 > Flashcards

Physics test 1 Flashcards

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1
Q

4 ways musical instruments make different sounds

A
  1. When an air collumn vibrates
  2. when a string vibrates
  3. When you hit them
  4. When a skin or a metal bar vibrates
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2
Q

What 3 factors make a string instrument produce a higher note?

A
  1. A shorter string
  2. A tighter string
  3. A thinner string
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3
Q

What 3 factors make a string instrument produce a lower note>

A
  1. The longer the string, the lower the note
  2. The looser the string, the lower the note
  3. The thivker the string, the lower the note
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4
Q

What conditions are required for sound waves to be able to travel?

A

If there are particles to transmit the vibration.

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5
Q

What kind of wave does sound travel as?

A

A longitudinal wave

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6
Q

What helps sound waves travel well?

A

When particles are close together to pass on the vibration.

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7
Q

How well does sound travel in:
1. a solid
2. a liquid
3. a gas

A
  1. Solid = very well
  2. Liquid = fairly well
  3. gas = poorly
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8
Q

Sound travels through a vacuum.
True or false?

A

False - sound doesn’t travel through a vacuum because there are not particles to pass on the vibration.

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9
Q

What speed does sound travel at in metals?

A

6000 metres/second (m/s)

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10
Q

Which travels faster, light or sound?

Give an example of this

A

Light travels faster than sound

We see lightening before we hear thunder unless the storm is overhead.

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11
Q

What is the speed of light in space?

A

300,000,000 metres/second (m/s)

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12
Q

What is the speed of sound in air?

A

330 metres/second (m/s)

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13
Q

What is an echo?

A

An echo is a reflection of sound from a hard surface.

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14
Q

What does frequency mean?
What is it measured in?

A

Frequency means the amount of waves per second.

Measured in hertz (Hz)

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15
Q

What does high frequency mean?

A

High frequency means many waves close together (short wave length)

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16
Q

What does a musical note sound like when the frequency is high?

A

The note sounds high in pitch.

17
Q

How is sound created?

A

Sound is created by something vibrating, the vibrating object causes air particles next to it to vibrate, which then cause the nect particles to vibrate.

A disturbance of air moves out from the source of the sound.

18
Q

How does sound travel

A

Sound travels through the air in waves, and may eventually reach the ear of the listener.

19
Q

What is a medium in physics?

Give 4 examples of mediums

A

A substance which something travels through

  1. Solid
  2. Liquid
  3. Gas
  4. Vacuum
20
Q

What is the equation for calculating the speed of sound through an substance?

A

Distance (m) divided by time (s)

Speed of sound = m/s

21
Q

Explain how you can increase the pitch of a sound wave

A

To increase the pitch - you need to increase the number of waves per second/frequency.

You also need to decrease the wavelength

22
Q

Define amplitude?

A

The amplitude is also know as the volume - the height of a sound wave..

23
Q

Explain how you can increase the volume of a sound wave

A

To increase the volume you need to increase the height of the soundwave.

24
Q

What happens to the amplitude when the volume increases?

A

The amplitude increases

25
Q

Define sound frequency

What is it measured in?

A

Frequency is how many waves there are per second

Hertz (Hz)

26
Q

Label the ear in order that sound waves travel through it

A
  1. outer ear
  2. ear canal
  3. ear drum
  4. three ear bones
  5. cochlea
  6. auditory nerve
27
Q

What is sound measured in

What is unwanted sound called?

A

decibels (dB)

noise

28
Q

Define wavelength

A

Wavelength is a measurement of the length of one full wave form. (Peak to peak/trough to trough)

29
Q

What speed does sound travel at in water?

A

1500 m/s

Year 8 science (1 decks)

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