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Topic 1 - Light
Visible light is a form of energy that can be detected with your eyes.
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How do we see

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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

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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.
  

Sound in A Vacuum