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Physics 3 > Waves > Flashcards

Waves Flashcards

1
Q

Give examples of transverse waves

A

Light, secondary waves and all of the EM waves

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2
Q

Give examples of longitudinal waves

A

Primary, sound

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3
Q

How do transverse waves travel?

A

At 90 degrees to the direction of the vibration

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4
Q

How do longitudinal waves travel?

A

In the same direction as the vibration

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5
Q

What are the conditions for refraction?

A

Light must enter the object at an angle greater than 0 degrees and less than 90 degrees

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6
Q

Define refraction

A

The bending of light

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7
Q

As light passes from air to glass, is the refracted ray bent towards or away from the normal?

A

Towards

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8
Q

As light passes from glass to air, is the refracted ray bent towards or away from the normal?

A

Away

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9
Q

What is the angle of incidence equal to?

A

The angle of reflection

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10
Q

Why does light bend towards the normal when passing from a less dense medium into a denser medium?

A

It slows down

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11
Q

Why does light bend away from the normal when passing from a more dense medium into a less dense medium?

A

It speeds up

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12
Q

What happens when the angle of incidence is greater than the critical angle?

A

Total internal reflection

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13
Q

What are the 2 conditions for total internal reflection?

A
  1. The angle of incidence is > than the critical

2. Light travels from a denser medium to a less dense medium

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14
Q

Name 2 things that use total internal reflection

A

Endoscopes and optical fibres

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15
Q

What instrument is used to detect seismic waves?

A

Seismometer

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16
Q

Which seismic wave is fastest?

A

Primary

17
Q

Which seismic wave can travel through liquids and solids?

A

Primary

18
Q

Which seismic wave is second fastest?

A

Secondary

19
Q

Which seismic wave can travel through solids only?

A

Secondary

20
Q

Which seismic wave is slowest?

A

Surface

21
Q

Which seismic wave is the most destructive and why?

A

Surface as they travel around the Earth’s surface and may produce a rolling motion

22
Q

How have scientists used effects of earthquakes to find the Earth’s structure?

A

S wave shadow zone suggests that part of the Earth’s core is liquid

Positions that waves are detected suggest that the density of rock changes, as waves are refracted

23
Q

If seismic waves are bent in curves, what does it suggest about the density of rock in the inner Earth?

A

It changes gradually

24
Q

If seismic waves are bent sharply, what does it suggest about the density of rock in the inner Earth?

A

It changes suddenly

25
Q

Name the two types of wave

A

Transverse and longitudinal

Physics 3 (3 decks)

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