Light Basics Flashcards
(13 cards)
1
Q
What is the crest?
A
the apex of the wave
2
Q
What is the wavelength?
A
The size of a wave, can be measured from crest to crest.
3
Q
What is the trough?
A
the tip of the dip in the wave.
4
Q
order of the electromagnetic spectrum:
A
radiowave, microwaves, infrared, viable light, ultraviolet, X-waves, gamma rays.
5
Q
Radiowaves
A
- long wavelength, low energy, and low frequency
- used in broadcasting TV and radio
- 1st on EMS
6
Q
Microwaves
A
- long wavelength, low energy, low frequency
- used in cooking/heating food, radar, telephone and other signals
- 2nd in EMS
7
Q
Infrared
A
- long wavelength, low energy, and low frequency
- used to in remote controlls
- 3rd in EMS
8
Q
Visible light
A
- medium wavelength, a bit of energy, and a bit of frequency
- makes things able to be seen
-4th in EMS
9
Q
ultraviolet
A
- short wavelength, high energy, high frequency
- used in tanning beds, and fluorescent tubes
- 5th in EMS
10
Q
What is frequency?
A
How fast the wave travels through a point.
11
Q
What is light?
A
- Light is a form of Energy
- Light travels in waves
- Light does not need matter to move
- Light is fast -it travels at a speed of 300,000 km/s!
12
Q
waves in different medians
A
dense median = waves moves towards the normal
less dense median = wave moves away from the normal
13
Q
The speed of light
A
300,000 km/s
