# Physics P1 - Waves and Redshift

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• Created by: .Adam.
• Created on: 29-04-16 14:17
What is the approximate range of the EM spectrum, in metres?
10^4 to 10^-15 metres
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In order from longest wavelength to shortest, what is the order of the different types of waves in the EM spectrum?
Radio, Microwave, Infrared, Visible, Ultraviolet, X-ray, Gamma
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For maximum diffraction to occur, how wide should the gap in which the wave is travelling through be?
The size of the wavelength
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The volume of a TV is turned up. What happens to the amplitude and wavelength?
The amplitude increases, but the wavelength remains the same.
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How is infrared used for communication?
TV remotes and Fibre Optics (NOT mobile phones, satellites, etc)
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Name two ways Radio Waves are used for communication?
TVs and Radios
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What type of waves are used by satellites?
Microwaves
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What is a mechanical wave?
A mechanical wave is a wave that requires particles, but there is no rule whether it is transverse or longitudinal. (Sound, for example, is a mechanical wave)
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What is a wave?
Waves are vibrations that transfer energy from place to place without matter (solid, liquid or gas) being transferred.
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In a transverse wave, what direction do the particle vibrations travel in, in terms of wave direction?
They travel perpendicular to the wave direction.
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What is the equation for wave speed?
v = f * λ ( velocity (m/s) = frequency (Hz) * wavelength (m)
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A microwave is travelling through a vacuum at 300,000,000 m/s (speed of light). It has a wavelength of 1cm. What is it's frequency?
v = f * λ --- 300,000,000 = f * 0.01 --- f = 300,000,000 ÷ 0.01 --- f = 30000000000 Hz (30 GHz, 3000 MHz, 30000000 KHz)
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## Other cards in this set

### Card 2

#### Front

In order from longest wavelength to shortest, what is the order of the different types of waves in the EM spectrum?

#### Back

Radio, Microwave, Infrared, Visible, Ultraviolet, X-ray, Gamma

### Card 3

#### Front

For maximum diffraction to occur, how wide should the gap in which the wave is travelling through be?

### Card 4

#### Front

The volume of a TV is turned up. What happens to the amplitude and wavelength?

### Card 5

#### Front

How is infrared used for communication?

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