Theo 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 transverse waves 3. cannot travel through space 4. all travel at the same speed in a vacuum line 1 has a mistake. line 2 has a mistake. line 3 has a mistake. line 4 has a mistake.

Line 3 has a mistake.

Explanation:

Electromagnetic waves consist of oscillations of electric and magnetic fields that oscillate perpendicular to the each other. Therefore, Line 1 is correct.

Also, the fields in an electromagnetic waves oscillate perpendicular to the direction of propagation of the wave: therefore, they are transverse waves. So Line 2 is also correct.

Electromagnetic waves, contrary to mechanical waves, do not need a medium to propagate: so, they can also travel through a vacuum. Therefore, Line 3 is wrong.

Finally, all electromagnetic waves travel through a vacuum at the same speed, called speed of light:

So, Line 4 is also correct.

answer///scientific method;