Chapter 10 - Electro. Radiation Flashcards
1
Q
what are electromagnetic waves
A
waves that are generated through a oscillating electrical charges
2
Q
what is duel nature
A
when a particle has wave-like and particle-like characteristics
3
Q
what’s photons
A
particles of electromagnetic radiation
4
Q
give 2 characteristics of transverse waves
A
- can move through vacuum
* move at 3 x 10^8 m.1^-1
5
Q
name 5 characteristics of gamma rays
A
- great penetrating ability
- only large amount of lead can stop it
• causes ionization through material it
passes through
- possesses greatest amount of energy
- extremely dangerous to all living things
6
Q
name 2 characteristics of x-rays
A
- penetrate soft tissue but absorbed by denser matter like bones
- cause ionization of materials through which they pass
7
Q
name 3 characteristics of ultraviolet radiation
A
- large amounts emitted by sun
- harmful to humans
- overexposure can lead to skin diseases and skin cancer
8
Q
characteristics of visible light
A
- light that we can see
* emitted by the sun but small amount are absorbed by ozone layer
9
Q
characteristics of infra red
A
- can’t be detected by the eye
- absorbed by matter = increase in temperature
- treatment of muscular complaints & drying paint on cars
10
Q
characteristics of long radio waves
A
- diffract around mountains and follow the curvature of the earth
- have good reception
11
Q
characteristics of short radio waves
A
- reflect off electrically charged layers in upper atmosphere
- fluctuation in these layers affect reception of broadcasts of these waves
