2.1 (f)

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Demonstration 1

With reference to a demonstration used in 2.1 (d) (speaker and 2 x microphone), knowing the frequency of the generated sound and placing the speakers one wavelength apart, a value for the speed of sound can be calculated. This should then be compared to a set up where two micorphones are set up to a timer, so that when a piece of metal is hit, the first microphone starts the timer when the sound gets to it and when the sound gets to the second microphone it stops; knowing the distances between the microphones allows for a value of the speed to sound to be caulcated.

Resources

The use of the equation c = f x λ should be explained in the context of electromagnetic waves where c is the speed of light and questions should be given to the pupils.

Analysis

A full analysis of the uncertainities can be done on both methods with this experiment. Compare the reliability of both methods.

Equipment

Safety

Syllabus

Waves & Particles