##### Physics (Chapter 7)- General Properties Of Waves

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1

Transverse wave

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

2

Longitudinal wave

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

3

Name several features of a wave

-Amplitude
-Period
-Crest
-Trough

4

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

the more energy the waves carry

5

Frequency

The number of waves passing through a point in one secon

6

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

7

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

8

Diffraction

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

9

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

The greater the effect of diffraction

10

Explain the properties of diffracted waves using the examples of:

1) Ultrasound

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

11

Interference

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

12

When are waves canceled

When a crests from a wave cancels troughs from another wave

13

When are waves reinforced?

When crests or troughs meet

14

Which is more powerful in terms of amplitude?

Crest meet crest

Trough meet trough