# visible light & solar system continued

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• Created by: Mahima
• Created on: 30-05-13 18:23
Waves ??
vibrations that transfer energy from place to place without matter - solid, liquid or gas - being transferred.
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Which waves must travel through a medium ??
Sound waves and seismic waves are like this. They must travel through a medium. It is the medium that vibrates as the waves travel through.
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which waves dont need to travel through a substance (medium) ??
Visible light, infrared rays, microwaves and other types of electromagnetic radiation are like this. They can travel through empty space. Electrical or magnetic fields vibrate as the waves travel through.
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transverse waves ??
Light and other types of electromagnetic radiation are transverse waves. Water waves and S waves (a type of seismic wave) are also transverse waves. In transverse waves, the vibrations are at right angles to the direction of travel.
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longitudinal waves ??
Sound waves and waves in a stretched spring are longitudinal waves. P waves (relatively fast moving longitudinal seismic waves that travel through liquids and solids) are also longitudinal waves. In longitudinal waves, the vibrations are along the sa
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wave speed equation
wave speed (metre per second) = frequency (hertz) × wavelength (metre)
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When doenst refraction happen ??
Refraction doesn't happen if the waves cross the boundary at an angle of 90° - in that case they carry straight on.
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remember
Remember that sound and light waves behave just like water waves in a ripple tank. The bending follows a regular pattern.
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## Other cards in this set

### Card 2

#### Front

Which waves must travel through a medium ??

#### Back

Sound waves and seismic waves are like this. They must travel through a medium. It is the medium that vibrates as the waves travel through.

### Card 3

#### Front

which waves dont need to travel through a substance (medium) ??

### Card 4

#### Front

transverse waves ??

### Card 5

#### Front

longitudinal waves ??