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Physics Core > Waves > Flashcards

Waves Flashcards

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1
Q

How does light travel?

A

As a wave.

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2
Q

How can waves be measured?

A

By their amplitude, wavelength and frequency.

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3
Q

What are waves?

A

Waves are vibrations that transfer energy from place to place without matter.

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4
Q

Which waves can travel through empty space?

A

Microwaves, infrared rays, visible light

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5
Q

Transverse waves:

A

The oscillations are at right angles to the direction and energy transfer (has peaks and troughs)

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6
Q

What type of wave are light and other types of electromagnetic radiation?

A

Light waves.

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7
Q

What happens to the electromagnetic fields as waves travel?

A

They vibrate.

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8
Q

Longitudinal waves:

A

In longitudinal waves, the oscillations are along the same direction as the direction of travel and energy transfer.

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9
Q

What are some examples where there are longitudinal waves?

A

Sound waves and the waves in a stretched spring.

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10
Q

What are the two types of things that can be seen in a longitudinal wave?

A

Compressions and rarefactions

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11
Q

What is the amplitude of a wave?

A

The amplitude is the distance from the centre line to the peak or trough. (maximum disturbance from its undisturbed position.

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12
Q

What is the wavelength:

A

Wavelength is the distance between a point on one wave and the same point on the other wave (can do from peak to peak) (λ)

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13
Q

What is frequency:

A

The frequency of a wave is the number of waves that pass a certain point each second. (f)

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14
Q

How is wave speed measured?

A

In metres per second (m/s)

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15
Q

What is refraction?

A

Where waves change speed as they pass through a different substance.

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16
Q

What is diffraction?

A

Where waves meet a gap in a barrier, and spread out as they carry on through it. Smaller gap causes a bigger extent of spreading.

17
Q

What does the angle of incidence equal?

A

The angle of reflection

18
Q

The imagine in a plane mirror is:

A
  • virtual
  • Upright
  • laterally inverted
19
Q

What are radio waves used for?

A

used to transmit television and radio programmes. television uses a higher freq than radio.
A radio programme does not need to be in the view of the transmitter to receive signals, diffraction can happen.

20
Q

How are radio waves reflected in the ionosphere:

A

The lowest frequency radio waves are reflected from the ionosphere, allowing signals to be transmitted even though they arent in the line of sight.

21
Q

Which type of wave can pass through the ionosphere?

A

Microwaves.

22
Q

Uses of microwaves:

A

Used to transfer signals such as mobile phone calls, microwave transmitters on buildings

23
Q

What happens to the electromagnetic fields as waves travel?

A

They vibrate.

24
Q

Longitudinal waves:

A

In longitudinal waves, the oscillations are along the same direction as the direction of travel and energy transfer.

25
Q

What are some examples where there are longitudinal waves?

A

Sound waves and the waves in a stretched spring.

26
Q

What are the two types of things that can be seen in a longitudinal wave?

A

Compressions and rarefactions

27
Q

What is the amplitude of a wave?

A

The amplitude is the distance from the centre line to the peak or trough. (maximum disturbance from its undisturbed position.

28
Q

What is the wavelength:

A

Wavelength is the distance between a point on one wave and the same point on the other wave (can do from peak to peak) (λ)

29
Q

What is frequency:

A

The frequency of a wave is the number of waves that pass a certain point each second. (f)

30
Q

How is wave speed measured?

A

In metres per second (m/s)

31
Q

What is refraction?

A

Where waves change speed as they pass through a different substance.

32
Q

What is diffraction?

A

Where waves meet a gap in a barrier, and spread out as they carry on through it. Smaller gap causes a bigger extent of spreading.

33
Q

What does the angle of incidence equal?

A

The angle of reflection

34
Q

The imagine in a plane mirror is:

A
  • virtual
  • Upright
  • laterally inverted
35
Q

What are radio waves used for?

A

used to transmit television and radio programmes. television uses a higher freq than radio.
A radio programme does not need to be in the view of the transmitter to receive signals, diffraction can happen.

36
Q

How are radio waves reflected in the ionosphere:

A

The lowest frequency radio waves are reflected from the ionosphere, allowing signals to be transmitted even though they arent in the line of sight.

37
Q

Which type of wave can pass through the ionosphere?

A

Microwaves.

38
Q

Uses of microwaves:

A

Used to transfer signals such as mobile phone calls, microwave transmitters on buildings

Physics Core (4 decks)

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