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physics > waves-year 9 core questions > Flashcards

waves-year 9 core questions Flashcards

1
Q

What is a wave?

A

A disturbance that travels from one place to another, transferring energy but not matter

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2
Q

What are the two types of wave?

A

Longitudinal and transverse

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3
Q

What is a longitudinal wave?

A

A wave in which the vibrations are parallel to the direction of motion of the wave

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4
Q

What is a transverse wave?

A

A wave in which the vibrations are perpendicular to the direction of motion of the wave

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5
Q

What is a mechanical wave?

A

Waves that travel through a medium (substance)

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6
Q

Give two examples of mechanical waves.

A

Sound and waves on springs

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7
Q

Is sound transverse or longitudinal?

A

Longitudinal

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8
Q

What causes sound?

A

Vibrations

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9
Q

Give three examples of a transverse wave.

A

Light waves, radio waves, water waves

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10
Q

What is the name of the top of a wave (the point

with maximum displacement)?

A

The peak or crest

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11
Q

What is name of the bottom of the wave?

A

The trough

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12
Q

What is the equilibrium position?

A

The undisturbed position of particles or fields when they are not vibrating

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13
Q

What is the displacement of a wave?

A

The distance that a certain point in the medium has moved from the equilibrium position.

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14
Q

What is the amplitude of a wave?

A

The maximum displacement of a point of a wave

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15
Q

What is the wavelength of a wave?

A

The distance between two wave peaks

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16
Q

What symbol is used to represent the wavelength?

A

lamda, λ

17
Q

What is the unit of wavelength?

A

metres (m)

18
Q

What is a wave front?

A

A line that joins all the wave peaks of a wave together

19
Q

What is superposition?

A

The effect of two waves meeting and adding up or subtracting

20
Q

What is the frequency of a wave?

A

The number of waves passing a point per second

21
Q

What symbol is used to represent the frequency?

A

f

22
Q

What is the unit of frequency?

A

Hertz (Hz)

23
Q

What is the period of a wave?

A

The time taken for a full cycle of the wave

24
Q

What symbol is used to represent the period?

A

T

25
Q

What is the unit for period?

A

Seconds (s)

26
Q

What is the relationship between frequency and

period of a wave?

A

T = 1/f

27
Q

Which colour of visible light has the longest

wavelength

A

Red

28
Q

Which colour has the highest frequency?

A

Violet.

29
Q

What is the wave equation in words?

A

Wave speed = wavelength x frequency

30
Q

What is the wave equation using symbols?

A

v = λf

31
Q

What is an electromagnetic wave?

A

A transverse wave whose vibrations are changes within electric and magnetic fields

32
Q

What speed do all electromagnetic waves travel at

in a vacuum?

A

3,000,000,00 metres per second

33
Q

What letter is used to denote the speed of light?

A

c

34
Q

What is the speed of sound in air?

A

340 metres per second

physics (5 decks)

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