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5.7d 2017 > Waves > Flashcards

Waves Flashcards

1
Q

Define frequency.

A

The number of complete oscillations per second.

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2
Q

Define wavelength.

A

The distance from the peak of one crest to the peak of an adjacent crest.

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3
Q

Define amplitude.

A

The distance from the equilibrium position to the peak of a wave.

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4
Q

Define a longitudinal wave.

A

A wave where the direction of oscillation is parallel to the direction of energy transfer.

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5
Q

Define a transverse wave.

A

A wave where the direction of oscillation is perpendicular to the direction of energy transfer.

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6
Q

Define the time period.

A

The time taken for one complete oscillation.

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7
Q

What two things do waves transfer?

A

Energy and information.

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8
Q

Give an example of a transverse wave.

A

Light

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9
Q

Give an example of a longitudinal wave.

A

Sound

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10
Q

When a sound wave has a large frequency, how does it sound?

A

High pitched

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11
Q

When a sound wave has a large amplitude, how does it sound?

A

Loud

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12
Q

When a sound wave has a low frequency, how does it sound?

A

Low pitched

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13
Q

When a sound wave has a low amplitude, how does it sound?

A

Quiet

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14
Q

What is the equation for the speed of a wave?

A

wave speed = frequency x wavelength

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15
Q

What is the equation for the frequency in terms of time period?

A

Frequency = 1 / Time period

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16
Q

What is the equation for calculating the frequency of a wave?

A

Frequency = number of waves / time taken for those waves to pass a point

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17
Q

What is the range of human hearing?

A

20 Hz -> 20000 Hz

18
Q

What is ultrasound?

A

Sound waves above 20000 Hz

19
Q

What is the order of the EM spectrum with increasing frequency?

A

Radio, Micro, IR, Light, UV, X, Gamma

20
Q

What is the order of the EM spectrum with increasing wavelength?

A

Gamma, X, UV, Light, IR, Micro, Radio

21
Q

What is the order of the colours in increasing frequency?

A

Red Orange Yellow Green Blue Indigo Violet

22
Q

What is the order of the colours in increasing wavelength?

A

Violet Indigo Blue Green Yellow Orange Red

23
Q

What is an application of radio waves?

A

Broadcast communications

24
Q

What is an application of microwaves?

A

Satellite communication

25
Q

What two regions of the EM spectrum can be used for cooking?

A

IR, Micro

26
Q

What is a danger of microwaves?

A

Internal tissue heating

27
Q

What is an application of Infrared?

A

Television remotes

28
Q

What is a danger of infrared?

A

Skin burns

29
Q

What is an application of visible light?

A

Photography

30
Q

What is a danger of visible light?

A

Blindness

31
Q

What is an application of UV?

A

Tanning salons

32
Q

What are the dangers of UV?

A

Aging sunBurns and Cancer

33
Q

How can you protect against UV?

A

Sun tan lotion

34
Q

What is a medical application of X rays?

A

Shadowy images of bones for medical purposes.

35
Q

What is a danger of X rays?

A

Cell mutations, Cancer

36
Q

What is a non-medical application of X rays?

A

X ray crysallography

37
Q

What is a medical application of gamma rays?

A

Radiotherapy.

38
Q

What is a non-medical application of gamma rays?

A

Detecting cracks in metals.

39
Q

What is a danger of gamma rays?

A

Cancer, Cell mutation

40
Q

What is true of EM waves that is not true for other waves?

A

All can travel in a vacuum. All travel at the speed of light in a vacuum.

41
Q

What is the equation for refractive index of a material?

A

n = sin (i) / sin (r)

42
Q

What is the equation to calculate the critical angle?

A

sin (c) = 1 / n

5.7d 2017 (9 decks)

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