Physics (Chapter 7)- General Properties Of Waves

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1
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Transverse wave

-Oscillates perpendicular the the direction of energy transfer
-All electromagnetic waves are transverse waves

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Longitudinal wave

-Moves through a process of compression and rarifaction
-Travel parallel to the direction of energy transfer
-Sound waves (example)

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Name several features of a wave

-Amplitude
-Period
-Crest
-Trough

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The bigger the amplitude of the waves.....

the more energy the waves carry

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Frequency

The number of waves passing through a point in one secon

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When and how are waves refracted

When they pass through a medium of one density to another
-When the wavelets are slowed down, they changed direction

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How are waves reflected?

When waves bounce off a plane, it creates a wave let moving away from the plane. This wavelet lines up with the previous "reflected" wavelets to form a reflected wavefront

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Diffraction

The spreading of waves when the pass through a gap or move past an object

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The narrow the gap the waves pass through....

The greater the effect of diffraction

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Explain the properties of diffracted waves using the examples of:

1) Ultrasound
2) Radio reception and hills

1. The uCltra sound waves diffract and spread out through the womb, providing a clear image of the foetus

2. If hills are present between a radio transmitter and a hill, the radio waves are diffracted by the hill, but do not spread enough behind the hill

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Interference

The reinforcement or canceling of two identical sets of waves when they overlap.

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When are waves canceled

When a crests from a wave cancels troughs from another wave

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When are waves reinforced?

When crests or troughs meet

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Which is more powerful in terms of amplitude?

Crest meet crest

Trough meet trough