13: Electromagnetic Spectrum (EMS)

Question 1

What type of waves are electromagnetic waves?

Answer 1

Transverse waves

Question 2

At what speed do electromagnetic waves travel?

Answer 2

300,000,000 m/s (three hundred million) / 3.0 x 10^8 m/s

Question 3

What are electromagnetic waves?

Answer 3

Electromagnetic waves are self-propogating waves with both electric and magnetic components (which oscellate at right angles to each other in the direction of propogation)

Question 4

State the Electromagnetic Spectrum.
(7 categories, longest –> shortest λ)

Answer 4

Radio Wave, Microwave, Infrared, Visible Light, Ultraviolet, X-ray, Gamma Ray
EM_spectrum.png

Question 5

What medium do electromagnetic waves travel through?

Answer 5

Vacuum

Question 6

The shorter the λ..?

Answer 6

…the higher the frequency

Question 7

The higher the frequency..?

Answer 7

…the greater the energy of the wave

Question 8

The higher the frequency..?

Answer 8

…the greater the energy of the wave

Question 9

What are long, medium, and short radio waves used for?

Answer 9

AM (amplitude-modulation) radio communication

Question 10

What are VHF (very high frequency) radio waves used for?

Answer 10

High quality FM (frequeny-modulation) stereo radio & terrestrial TV communication

Question 11

What are the uses of Microwaves?

Answer 11

Cooking, radar communication, satellite communties (mobile phone networks)