# Physics P1 6.1 The electromagnetic spectrum.

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In order of increasing wavelength, what is the electromagnetic spectrum?
Gamma rays, x-rays, ultraviolet, visible, infrared, microwaves, radio waves.
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What can be used to calculate the frequency or wavelength of electromagnetic waves?
v = f x (strange symbol - look it up).
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What do electromagnetic waves do?
Transfer energy.
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Electric and magnetic disturbances.
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As waves and move energy from place to place.
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Can electromagnetic waves travel through space (a vacuum)?
They all travel through space at the same speed but they have different wavelengths and frequencies.
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What are all the waves collectively called?
The electromagnetic spectrum.
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How do we group waves?
According to their wavelength and frequency.
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What waves have the shortest wavelength and highest frequency?
Gamma rays.
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What waves have the longest wavelength and lowest frequency?
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What are the wavelengths of radio waves?
Radio waves can have wavelengths of more than 10000 metres.
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Why are the wavelengths and frequencies at the boundaries of the spectrum approximate?
The spectrum is continuous therefore the different parts of the spectrum are not precisely defined.
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What happens to different wavelengths of electromagnetic radiation?
Different wavelengths of electromagnetic radiation are reflected, absorbed or transmitted differently by different substances and types of surface.
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The higher the frequency of an electromagnetic wave the more...?
Energy it transfers.
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What do all electromagnetic waves travel through and at what rate?
Space at a wave speed of 300 million m/s.
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What can we link the speed of electromagnetic waves to?
Their wavelength and frequency using the equation v=fx(strange symbol - look it up)
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In the equation to calculate the frequency or wavelength of electromagnetic waves, what is the v?
The wave speed = 300 000 000m/s
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In the equation to calculate the frequency or wavelength of electromagnetic waves, what is f?
The frequency in hertz, Hz.
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In the equation to calculate the frequency or wavelength of electromagnetic waves, what is the strange symbol (that needs to be looked up)?
The wavelength in metres, m.
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What do electromagnetic waves transfer?
Energy NOT matter.
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What is the unit of frequency?
Hertz, Hz.
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Which part of the electromagnetic spectrum transfers the most energy?
Gamma rays.
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**YOU NEED TO KNOW HOW TO PUT THE DIFFERENT PARTS OF THE SPECTRUM IN THE CORRECT ORDER**
**YOU MAY BE ASKED IN AN EXAM FOR THE ORDER IN EITHER DECREASING OR INCREASING WAVELENGTH, FREQUENCY OR ENERGY SO BE AWARE AND DONT BE TRICKED**
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**LOOK UP DIAGRAMS OF THE ELECTROMAGNETIC SPECTRUM**
**
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## Other cards in this set

### Card 2

#### Front

What can be used to calculate the frequency or wavelength of electromagnetic waves?

#### Back

v = f x (strange symbol - look it up).

### Card 3

#### Front

What do electromagnetic waves do?