6.3 Radio Waves

Question 1

What are em waves made up of

Answer 1

Oscillating electric magnetic fields

Question 2

How can you produce radio waves

Answer 2

Using an alternating current in an electrical circuit the object which causes electrons to oscillate is a transmitter

Question 3

When radio waves reach receiver what happens ?

Answer 3

They are absorbed

Question 4

What happens to the energy carried by the waves ?

Answer 4

Transferred to the electrons in the material of receiver and this causes electrons to oscillate

Question 5

What are radio waves used for ?

Answer 5

Communication

Question 6

Can long wavelengths diffract around the curved surface of earth ?

Answer 6

Yes

Question 7

Where are short radio waves reflected from ?

Answer 7

The ionosphere

Question 8

Example of shortwave radio waves

Answer 8

Bluetooth to send over information between devices

Question 9

What are tv and fm radio wavelengths ?

Answer 9

Short wavelengths but you have to be in direct sight of Transmitter