Energy & Forces - Properties & uses of energy - Sound & Light - G24 - EF-F1.3

Energy & Forces - Properties & uses of energy - Sound & Light - G24
Development of Target F1.10
EF-F1.3	Describe the relationship between pitch & frequency and between loudness & amplitude
Use an oscilloscope and a microphone to examine sound waves.
State that :-	State that the height of the trace is called the amplitude.
	State that louder sounds have bigger amplitudes.
	State that the frequency of a sound is the number of vibrations per second.
	State that the frequency of a sound is measured in hertz.
	State that the greater the frequency of vibration the higher the pitch of the sound we hear.

1	Use Signal Generator, loudspeaker and CRO. Can look at signal on CRO and hear it from speaker. Get class to make drawings of the signal for loud/quiet/high/low.
2	Use a keyboard connected to speaker and oscilloscope to demonstrate link between appearance of waves and sound heard.
3	Ask pupils to describe sounds in terms of loudness and pitch from appearance of oscilloscope trace.