Jasper made a list of the properties of electromagnetic waves. identify the mistake in the list.

electromagnetic wave properties
1. are made up of an electric field and a magnetic field
2. are longitudinal waves
3. can travel through space
4. all travel at the same speed in a vacuum

1.Electromagnetic radiation can travel through empty space. Most other types of waves must travel through some sort of substance. For example, sound waves need either a gas, solid, or liquid to pass through in order to be heard.

2.The speed of light is always a constant. (Speed of light : 2.99792458 x 108 m s-1)

3.Wavelengths are measured between the distances of either crests or troughs. It is usually characterized by the Greek symbol  λ

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