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Physics > Waves > Flashcards

Waves Flashcards

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1
Q

What is a longitudinal wave?

A

When the vibrations are parallel to the direction of travel of the wave

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2
Q

What is a transverse wave?

A

When the vibrations are perpendicular to the direction of travel of the wave

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3
Q

Define amplitude

A

The maximum displacement from 0

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4
Q

What is wavelength?

A

The distance between two corresponding points on different waves/the distance between the start of two waves

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5
Q

What is time period?

A

The time taken for one complete wave to pass a point

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6
Q

What is frequency?

A

No. of waves passing a point in one second HZ

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7
Q

What do waves transfer?

A

Energy and information but not matter

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8
Q

What are radio waves used for?

A

Broadcasting and communication

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9
Q

What are microwaves used for?

A

Cooking and satellite communication

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10
Q

What is infrared used for?

A

Heaters and night vision

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11
Q

What is visible light used for?

A

Optical fibres and photography

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12
Q

What are ultraviolet rays used for?

A

Fluorescent lamps

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13
Q

What are x-rays used for?

A

Take a guess

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14
Q

What are gamma rays used for?

A

Sterilisation

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15
Q

List the electromagnetic spectrum in decreasing wavelength/increasing frequency

A 
Radio
Micro
Infrared
Visible
Ultraviolet
X
Gamma
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16
Q

What damage do microwaves do?

A

Internal heating of body tissue

17
Q

What damage do infrared rays do?

A

They burn the skin

18
Q

What harm do ultraviolet waves do?

A

Damage surface cells and cause blindness

19
Q

What damage do gamma rays do?

A

Cancer/mutation

20
Q

What is the difference between analogue and digital?

A
  1. Analogue can take any value within a certain range

2. A digital signal only takes two values

21
Q

Why is digital better than analogue?

A
  1. Both types need to be amplified
  2. They pick up interference along the way.
  3. Analogue amplifies the noise but digital doesn’t

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