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P1 (3) (Light and Mirrors (What happens if a mirror is curved? (Ray…
P1 (3)
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Using Waves
Radiation
Radio waves, Microwaves, Infrared, Visible light(electronic waves used for communication)
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Diffraction
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TV and VHF(very high frequency) signals have wavelengths of several metres which is much smaller than hills or buildings(receptors must be in direct line-of-sight)
Long-wave radio signals have wavelengths of several kilometres which is a similar size to hills and buildings
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Cable and Digital
Why use Digital
Analogue Signals can have any value, but Digital Signals are pulses that only have two values, on or off
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Fibre Optic Cables transmit fast with good quality and can carry many signals(thin, flexible and very pure glass)
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Searching Space
Looking Further
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earth-based
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easier to maintain, repair and update
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Seeing the Invisible
Astronomers can detect a wide range of electromagnetic waves emitted from different objects in space
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Ultraviolet(hot stars, quasars)
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Far Infrared(protostars, planets)
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Waves and Movement
Doppler and Light
Doppler Effect
If it moves towards and observer, the observed wavelength decreases and frequency increases
When a source of light, sound or microwaves move away from and observer, the observed wavelength increases and frequency decreases
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Mystery Object
The change in observed wavelength of light provides information on how distant objects move in relation to Earth
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