Light as an EM Wave

Question 1

Consequence of Maxwell’s Theory

Answer 1

He united ideas of electricity and magnetism into electromagnetism

There would be a transverse wave radiating outward if there is a change in electric or magnetic fields.

Question 2

What did he predict?

Answer 2

There would be a spectrum of EM waves with different wavelengths and frequencies.

Question 3

Fizeau determination of the C

Answer 3

Beam of light through the gap between rotating cog teeth which rotates so the reflected light is blocked by the next cog.

Used freq of rotation to calculate time for the light to travel to the mirror and back. With distance, he could find SoL.

Question 4

Maxwell and Fizeau

Answer 4

Maxwell’s calculated value was same as Fizeau’s measured value.

Question 5

Hertz do?

Answer 5

Produced and detected radio waves with use of electric sparks.

Question 6

Hertz Experiment

Answer 6

RW are produced when high voltage caused sparks to jump across a gap of air.

RW caused a P.D to be induced in a loop of wire, causing the sparks to cross a gap.

Fact that P.D was induced showed that the waves had a magnetic component.