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Slide 1

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waves…read more

Slide 2

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Waves carry energy from one place to another.
· For example,
energy from the Sun reaches us as well as waves
travelling across the vacuum of space.
· Sound, light and radio signals all travel in the form of
· There are two types of waves TRANSVERSE and

Slide 3

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Transverse Waves
· If you hold a piece of rope, and quickly move
your arm up and down, you will see wave
motion. (Up ­ down)
· Each bit of the rope vibrates at right angles to
the direction that the waves are travelling.
· Waves on ropes, waves on the surface of
water, and electromagnetic waves, - like light,
are all transverse waves.…read more

Slide 4

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Longitudinal waves
· In a longitudinal wave
the vibrations move in the same direction as
the wave is travelling
· The `squashes' are called compressions. The
air pressure here is higher than normal.
· The `stretches' are called rarefactions; the air
pressure here is lower than normal.
· Sound waves and compression waves in
springs are examples of longitudinal waves.…read more

Slide 5

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· Waves can be produced in ropes and springs and along the
surface of water.
· All these waves can be reflected (they bounce off surface).
· The waves which travel across the surface of water can also
be refracted .
· As the waves cross the boundary between two different
depths of water they change speed. This causes a change in
their direction (refraction), unless the direction of travel of
the waves is along a normal, i.e. at right angles to the
· A ripple tank can be used to study how waves behave.…read more

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