# Physics

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Why didn't scientists accept Wegener's theory?
He was an outside, supporting evidence was limited, continental movement couldn't be detected, it could be explained more simply.
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How is heat in the earth's core provided?
The decay of radioactive elements inside the earth release energy causing the interior to keep hot
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What evidence do scientists study to obtain information about the earth's age?
Fossils of plants and animals and the decay of radioactive rocks
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How do you calculate Wavelength?
wavelength = wave speed / Frequency
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How are old rocks destroyed?
Old rocks are destroyed using subduction
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What type of wave travels through the liquid outer core of the earth
P Waves (longitudinal waves)
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what two factors produce rock stripes of alternating polarity?
Deep-floor spreading and changing polarity of the earth magnetic field every millions of years.
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What type of wave is a sound wave?
A sound wave is a longitudinal wave ( P wave)
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How do you calculate wave speed?
Wave speed = Frequency x Wavelength
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What is someone describing if they tell you the 'number of waves produced per second'?
Frequency
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What is the difference between moons and asteroids?
Moons orbit planets and asteroids orbit the sun
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What two methods are used to measure the distance to stars?
Relative brightness and Parallax
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How do you calculate distance?
Distance = wave speed x time
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How is the wavelength of light changed if the source of light is moving away?
The wavelength increases ( Red shift)
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A 3m wave has a frequency of 12HZ. What speed is it travelling at?
12 x 3 = 36m/s
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What is a transverse wave?
A transverse wave is a wave in which the vibrations are at 90 degrees to the direction of energy transfer.
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What is a longitudinal wave?
longitudinal wave is a wave in which the movement of particles is in line with the direction in which the energy is being transferred.
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P waves can travel through...
both solids and liquids
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S waves can travel through...
only solids
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How do earthquakes occur?
1)The plates slide past each other or collide 2) Pressure builds up as plates push up on each other. 3) Eventually the stored energy is released and waves of energy press up from the epicenter.
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## Other cards in this set

### Card 2

#### Front

How is heat in the earth's core provided?

#### Back

The decay of radioactive elements inside the earth release energy causing the interior to keep hot

### Card 3

#### Front

What evidence do scientists study to obtain information about the earth's age?

### Card 4

#### Front

How do you calculate Wavelength?

### Card 5

#### Front

How are old rocks destroyed?

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