Light & EM spectrum Flashcards
1
Q
What is the difference between specular and diffuse reflection?
A
Diffuse reflection is on an un even surface and specular reflection is on a smooth surface.
2
Q
What are radio waves used for?
A
Sending messages
3
Q
Why are microwaves for sending signals to satellites in space
A
because they aren’t reflected or refracted going through the earths atmosphere.
4
Q
Why is infra red used for heating
A
because it hits objects and heats them up
5
Q
What do optical fibres do?(visible light)
A
use optical fibres to carry telephone and TV signals.
6
Q
Why is UV good for lightbulbs?
A
It has a short wavelength and therefor carries more energy.
7
Q
What can gamma rays and x rays do that others can’t?
A
can easily penetrate through tissue to show broken bones and gamma rays can detect cancers.
8
Q
A
