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Physics > CP4 > Flashcards

CP4 Flashcards

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1
Q

What can waves transfer?

A

Energy and information

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2
Q

What can waves NOT transfer?

A

Matter

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3
Q

What direction do particles vibrate in transverse waves?

A

A right angle to the direction of the wave

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4
Q

What direction do particles vibrate in longitudinal waves?

A
  • Same direction as the wave
  • Back and forth
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5
Q

What is wave frequency and what is it measured in?

A
  • Number of waves passing a point each second
  • Measured in hertz (Hz)(1 Hz = 1 wave passing each second)
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6
Q

What is a period?

A

Length of time it takes one wave to pass a given point

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7
Q

What is wavelength?

A

Distance from a point on one wave to a point in the same position on the next wave

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8
Q

What is the amplitude of a wave?

A

Maximum distance of a point on the wave away from its rest position

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9
Q

What is the velocity of a wave?

A

Speed of the wave in the direction it is travelling

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10
Q

Why are solids better for waves to travel through compared to gas?

A

In a solid ,the particles are closer together, so the waves/particles vibrate more

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11
Q

How can you figure out frequency using the period?

A

Frequency = 1/period

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12
Q

What is refraction?

A
  • Bending of light
  • Happens at the interface between 2 medias (air to glass)
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13
Q

The denser the medium…

A

…the slower the light travels

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14
Q

When waves slow down…

A

…it bends towards the normal

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15
Q

When waves speed up…

A

…it bends away from the normal

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16
Q

Where is the normal drawn?

A

90*/right angle to an interface

17
Q

What happens if a ray of light crosses an interface a right angle?

A

It’s direction will not change

18
Q

Wave speed formula (with time)

A

wave speed (m/s) = distance (m) / time(s)

19
Q

Wave speed formula (with frequency)

A

wave speed (m/s) = frequency (Hz) x wave length (m)

Physics (5 decks)

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