Topic 1 - Light
Visible light is a form of energy that can be detected with your eyes.
How do we see
How Old are your Ears?
The Cathode Ray Oscilloscope (C.R.O)
The cathode ray oscilloscope is an instrument that allows sound waves to be displayed on a screen.
By looking at these waves, we can discuss how loud the sound is and what its pitch may be.
The Speed of Sound
Q. A bat sends out a high pitched squeak which echoes from objects in its path. This is how it knows that an object is there.
A moth is 51 metres from the bat. The bat sends out a squeak which echoes off the moth and returns 0.3 seconds later.
a) How far did the sound travel? (remember it had to travel to the moth and back again.)
b) Now calculate the speed of sound in air.
A moth is 51 metres from the bat. The bat sends out a squeak which echoes off the moth and returns 0.3 seconds later.
a) How far did the sound travel? (remember it had to travel to the moth and back again.)
b) Now calculate the speed of sound in air.
Sound in A Vacuum
