NOT DONE!!!!!Chapter #15 - Electromagnetic (EM) Waves

Question 1

What are the seven EM waves in order of least to most frequency (most to least wavelength)?

Answer 1

• Radio waves
• Micro-waves
• Visible light
• Ultra-violet
• X-rays
• Gamma rays

Question 2

How are EM waves grouped?

Answer 2

Based on their wave lengths.

Question 3

What is the rule with EM waves and their wavelength + frequency.

Answer 3

• If the frequency is higher, the wavelength is shorter
• If the wavelength is longer, the frequency is lower
  This means all the EM waves travel at the same speed

Question 4

What speed do most EM waves travel at?

Answer 4

3.0 x 10^8 m/s

Question 5

How big is the wavelength of radiowaves?

Answer 5

1m - 10^4 m

Question 6

How big is the wavelength of micro-waves?

Answer 6

10^-2 m (1 cm)

Question 7

How big is the wavelength of infra-red waves?

Answer 7

10^5 m (0.01mm)

Question 8

How big is the wavelength of visible light?

Answer 8

10^-7 m

Question 9

How big is the wavelength of ultra-violet light?

Answer 9

10^-8 m

Question 10

How big is the wavelength of x-rays?

Answer 10

10^-10 m

Question 11

How big is the wavelength of gamma rays?

Answer 11

10^-12 m

Question 12

What are radio waves used for?

Answer 12

Radio and TV transmissions

Question 13

Whar is a trick to remember the EM spectrum?

Answer 13

Raging Martians Invaded Venus Using X-ray Guns

Question 14

What waves do stalite communications use?

Answer 14

Micro-waves

Question 15

What are two different satallites?

Answer 15

• Low orbit
• Geostationary

Question 16

What are some charectaristics of low orbit satalites?

Answer 16

1. Orbit close (low) to the earth(1000 km)
2. Orbits are fast (2 hrs) because they are close.
3. Need multiple satellites to maintain coverage at all times (because they are close and orbit fast)

Question 17

What are some charectaristics of geostationary satellites?

Answer 17

• Have high orbit around earth
• Orbit every 24 hours
• Stay at the same point above the earths surface because orbit at the same speed the earth turns

Question 18

What are geostationary satellites ideal for and why?

Answer 18

They are ideal for communication because it is easy topoint transmitters and recieve them. Also, they can transfer signal from one side of the earth to the other in a fraction of a second.

Question 19

What satellites do phones use?

Answer 19

Low orbit and geostationary satelites.

Question 20

What satellites do TV’s use?

Answer 20

Geostationary