# P1.5 AQA GCSE Waves

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What is the difference between transverse and longitudinal waves?
Tranverse waves: Oscillations are perpendicular to wave direction; Longitudinal waves: Oscillations are parallel to wave direction
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Name a transverse and a longitudinal wave
Light and sound respectively
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Lowest/highest audible frequencies of sound?
20Hz-20kHz
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1 hertz=
1 wave per second
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What is red shift?
When light from distant stars has a longer wavelength than it should, as the star is moving away from us?
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What theory does this provide evidence for and why?
The Big Bang theory, as many stars show red shift, it suggests the entire universe is expanding from a single point
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What effect causes red shift?
The doppler effect
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What is Cosmic Microwave Background Radiation?
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What causes refraction when light passes through a medium?
The light waves slow down/speed up as they change the medium they are travelling through, this causes them to bend, based on the density of the two media
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What is diffraction?
When waves spread out when they pass through a gap
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What size gap is necessary to cause a wave to diffract most?
Size of gap=Wavelength
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Angle of incidence=
Angle of reflection
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Reflected images are:
Virtual, Upright, Laterally inverted, the same size and the same distance away from the mirror
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## Other cards in this set

### Card 2

#### Front

Name a transverse and a longitudinal wave

#### Back

Light and sound respectively

### Card 3

#### Front

Lowest/highest audible frequencies of sound?

1 hertz=

### Card 5

#### Front

What is red shift?