The number of different colors created will be very few compared to the previous demonstration. Using a Clacker Toy to Find the Speed of Sound Purpose To estimate the speed of sound using sa simple device and formula. Method Take the clacker outside and find a wall of the school building that produces a good echo. Move away from the wall until the echo seems to be superimposed on the clacks . A vertical movement of the handle at just the right frequency will result in collisions of the balls at a certain frequency.
Students are much better at operating the toy than teachers.
The period of the motion can be measured with a stopwatch. The distance traveled by the echo will be 2d , and the time of travel will be the period of the clacker, T . This is a way to determine a student s center of gravity. Meter stick Method Find the center of gravity of the board by measuring the board and marking it at midpoint. Position the scales so that the scale can be read easily.