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P1 Physics > deck_3580650 > Flashcards

deck_3580650 Flashcards

1
Q

complete this sentence… a seismograph shows the…

A

different types of earthquakes

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2
Q

at what speed to P waves travel through the earth?

A

5-8 km/s

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3
Q

at what speed do S waves travel through the earth?

A

3-5.5 km/s

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4
Q

complete this sentence… P waves can travel through…

A

solids and liquids

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5
Q

complete this sentence… S waves can travel through…

A

solids

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6
Q

complete this sentence… P waves are refracted by…

A

the core

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7
Q

why do we know using S waves that the core is made of liquid?

A

because S waves cannot travel through liquids so don’t travel as far

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8
Q

how is a tan caused?

A

by the concentration of ultra-violet light on the skin

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9
Q

complete this sentence… cells in the skin produce…

A

a pigment called melanin

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10
Q

why don’t people with darker skin tan as easily?

A

because ultraviolet radiation is filtered out

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11
Q

where is the ozone?

A

in the stratosphere

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12
Q

what does the ozone do?

A

filter out ultraviolet radiation

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13
Q

what destroys the ozone layer?

A

CFC’S from aerosols and refrigerators

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14
Q

Why is the ozone layer at its thinnest above the south pole?

A

because ozone depleting chemicals work best in cold conditions

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15
Q

how do scientists monitor the thickness of the ozone layer?

A

by using satellites

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16
Q

what causes an earthquake?

A

when rock deep below the surface of the earth move suddenly at a fault

17
Q

describe the features of a seismograph

A

-a heavy weight with a pen attatched suspended above a rotating drum. There is a paper on the drum. The base is bolted to solid rock

18
Q

where does an earthquake happen?

A

below the earths surface at the surface.

19
Q

what is the epicentre?

A

the point above the focus

20
Q

what is an L wave?

A

a surface wave meaning it travels out from the epicentre relatively slowly

P1 Physics (8 decks)

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