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PHYSICS P2 > WAVES > Flashcards

WAVES Flashcards

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1
Q

what is a wave?

A

a transfer of energy

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2
Q

what is a longitudinal wave?

A

a wave in which the vibrations travel parallel to the wave direction
e.g. sound waves

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3
Q

what is a transverse wave?

A

a wave in which the vibrations travel perpendicular to the wave direction
e.g. light and radio waves

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4
Q

what is the wave called when its bunched up?

A

compression

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5
Q

whats the wave called when its spread out/not bunched up?

A

rarefraction

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6
Q

what is a mechanical wave?

A

a wave which requires particles e.g. sound wave

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7
Q

what is an electromagnetic wave?

A

a wave which doesn’t require particles

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8
Q

what is the wavelength?

A

the same point on 2 adjacent waves

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9
Q

what is frequency?

A

the number of waves per second

measured in Hz

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10
Q

what is period?

A

the time it takes for 1 wave to pass by

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11
Q

how to use a ripple tank?

A 
look at shadows
add pointer and count how many waves pass in 10 seconds
divide by 10
measure distance with ruler
use calculation
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12
Q

what happens when sound increases?

A

amplitude increases which causes the waves to look taller

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13
Q

what is the healthy hearing range for humans?

A

20 - 20,000 Hz

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14
Q

what occurs on a rough surface?

A

diffuse scattering

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15
Q

what occurs on a smooth surface?

A

specular reflection

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16
Q

how do sound waves work to hear sounds?

A

waves enter ear (longitudinal)
sound waves cause ear drum to vibrate
vibrations are turned into electrical signals
electrical signals sent to the brain

17
Q

what happens when a wave enters a more dense material?

A

bends towards normal line
slows down
wavelength decreases

18
Q

what happens when a wave enters a less dense material?

A

bends away from normal line

speeds up

19
Q

what is the law in the refraction RP?

A

angle of incidence = angle or reflection

20
Q

what is an ultrasound?

A

wave with a higher frequency than the upper limit of humans

21
Q

how do ultrasounds work?

A

pass ultrasound through material
wave hits boundary and is reflected back
time taken for reflection to reach detector used to produce image

22
Q

what is echo sounding?

A

high frequency sound

time how long it takes for reflection to reach detector used to measure how deep water is

23
Q

what is an S seismic wave?

A

transverse

in solids

24
Q

what is a P seismic wave?

A

longitudinal
liquids + solids
travels faster in solids than liquids

PHYSICS P2 (1 decks)

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