Electromagnetic Radiation
What type of electromagnetic radiation is used to identify a broken bone?
X-ray
Why is visible light used as a model for all electromagnetic radiation? (2 reasons)
- Safe and easy to use
- We can see it
What does the wave model of light propose?
That light travels as a wave.
What is frequency?
How many wavelengths pass per second.
What does the particle model of light propose?
That light travels as a particle.
What type of electromagnetic radiation causes sun burns?
Ultraviolet
What does the ray model of light propose?
That light travels in a straight line.
The highest point on a wave.
Crest
What is frequency measured in?
Hertz.
If something spins 50 times in 10 seconds, what is the frquency?
5 hz
What type of electromagnetic radiation is used to treat thyroid cancer?
Gamma
What are the 3 models of visible light?
- Ray
- Wave
- Particle
The lowest point on a wave.
Trough
If there is a long wavelength, the frequency will be _____?
low
Do red photons or blue photons give off electrons when they hit metal?
Blue.
What types of electromagnetic radiation are given off by your cellphone? (3)
- visible
- micro
- radio
Why do objects closer to a light source cast larger shadows?
They are covering more of the light!
The distance from one crest to another (or trough to trough)
Wavelength
If there is a short wavelength, the frequency will be ______?
High
Which colour of the rainbow has the most energy?
Violet.
Name all 7 types of electromagnetic radiation.
- Visible
- Gamma
- X-ray
- Ultraviolet
- Micro
- Radio
- Infrared
Which model of light is correct?
All of them!
Distance from the center line to the crest or trough.
Amplitude.
If there are 10 waves in 5 seconds, what is the frequency?
2 hz
Which colour of the rainbow has the longest wavelength?
Red