Physics 1
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- Created by: 13aj
- Created on: 19-04-17 19:00
What are transverse waves
The oscillations of the particles are at right angles to the direction of travel (propagation) of the wave
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What are longitudinal waves
the oscillations of the particles are in the same direction as the wave is moving.
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All... waves are S waves
electromagnetic
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Angle of incidence=
angle of reflection
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If a curved (concaved) barrier such as a... is used, the waves can be made to...
satellite dish. converge (concentrate) at a point.
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What is refraction
The change in direction of a wave at the boundary between two materials. This is caused by speed
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Refraction in water happens when water waves passses between...
deep and shallow water
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Does deep or shallow waves move more slowly
shallow waves
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When refracted, frequency of the waves... and wavelength...
remains constant. decreases
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When water moves from shallow to deeper water...
the speed increases and the wave changes direction away from the normal
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Whne light passes in between... it causes the light ray to refract
materials of different optical fibres
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WHne light moves from air to... it... and...
glass. Slows down. Bends towards the normal
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When the light emerges from the galss block it...
speeds up and bends away from the normal
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Total internal relection
Angle of refraction, crictical angle and total internal reflection
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The incident angle is... the critical angle and so...
less than. the light ray refracts/bnds away from the normal as it emerges from the water.
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The incident angle is... to the critical angle and so...
equal. the light ray passes along the surface of the boundary
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The incident angle is... the critical angle and so...
greater than. The light ray is reflected back into the water. This phenomenon is known as total internal reflection
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What is an endoscope
An instrument that is used to look inside the body. Thousands of optical fibres are bundled together in an endoscope which is insterted into a human body. Light can be directed down the fibres even if they are bent, allowing surgeons to illuminate th
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What are the 3 types of seismic waves
P waves, S waves and surface waves
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Earthquakes result from P, S and surface waves generated by the...
release of energy stored in rocks on either side of a fault.
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Primary waves
Longitudinal waves. Faster than S waves. Travel through liquids and solids
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Seconday waves
Transverse waves. Travel slower than P waves. Can only travel through solids
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Surface waves
Higher amplitudes than P and S waves. Usually cause building to be knocked down. Formed from a combination of P and S waves. Generally the slowest of the three
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The velocity depends upon:
1. The density of the rock/material. The higher the density the more slowly waves travel. 2. The rigidity of the material, waves travel more quickly the more rigid/stiff the material is
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Does rigidity or density have a greater effect
Rigidity
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What waves can travel through the crust (solid)
P waves, S waves and surface waves
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What waves can travel through the mantle (solid)
P waves and S waves
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What waves can travel through the outer core (liquid)
P waves only
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What waves can travel through the inner core (solid)
P waves
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Refraction in mantle. The waves curve because the... edge travels... than the... edge and so it overtakes the... . This makes it bend upward. Both... waves curve like this
bottom. faster. top. top. bend upwards. P and S waves
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P and S waves travel faster the....
deeper they go into the mantle
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The waves refract at the...because they...
core-mantle boundary. slow down
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The deeper the waves get the... they become because the core is... at greater depths.
faster. more rigid
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What are seismograms used for
they are used to locate epicentre of an earthquake
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Shadow zones fro P waves
Are the two smaller shadow zones
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Shadow zones for S waves
Large shadow zone at the opposite side of the Earth from the epicentre
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There is a considerable change in density from the
solid mantle to the liquid outer core.
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The S shadow zone is....
due to a liquid outer core and shows that there must be a molten layer and gives evidence for its size
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The P shadow zone...
reveals the amount of refraction at the core and gives evidence for its density/rigidity
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Other cards in this set
Card 2
Front
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Back
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Card 3
Front
What are longitudinal waves
Back
Card 4
Front
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Back
Card 5
Front
All... waves are S waves
Back
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