NOT DONE!!!!!Chapter #15 - Electromagnetic (EM) Waves Flashcards
NOT DONE!!!!
What are the seven EM waves in order of least to most frequency (most to least wavelength)?
- Radio waves
- Micro-waves
- Visible light
- Ultra-violet
- X-rays
- Gamma rays
How are EM waves grouped?
Based on their wave lengths.
What is the rule with EM waves and their wavelength + frequency.
- 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
What speed do most EM waves travel at?
3.0 x 10^8 m/s
How big is the wavelength of radiowaves?
1m - 10^4 m
How big is the wavelength of micro-waves?
10^-2 m (1 cm)
How big is the wavelength of infra-red waves?
10^5 m (0.01mm)
How big is the wavelength of visible light?
10^-7 m
How big is the wavelength of ultra-violet light?
10^-8 m
How big is the wavelength of x-rays?
10^-10 m
How big is the wavelength of gamma rays?
10^-12 m
What are radio waves used for?
Radio and TV transmissions
Whar is a trick to remember the EM spectrum?
Raging Martians Invaded Venus Using X-ray Guns
What waves do stalite communications use?
Micro-waves
What are two different satallites?
- Low orbit
- Geostationary
What are some charectaristics of low orbit satalites?
- Orbit close (low) to the earth(1000 km)
- Orbits are fast (2 hrs) because they are close.
- Need multiple satellites to maintain coverage at all times (because they are close and orbit fast)
What are some charectaristics of geostationary satellites?
- 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
What are geostationary satellites ideal for and why?
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.
What satellites do phones use?
Low orbit and geostationary satelites.
What satellites do TV’s use?
Geostationary
