Question: A method for measuring the speed of sound using an ordinary watch with a second hand is to stand some distance from a large flat

A method for measuring the speed of sound using an ordinary watch with a second hand is to stand some distance from a large flat wall and clap your hands rhythmically in such a way that the echo from the wall is heard halfway between every two claps.

(a) Show that the speed of sound is given by v = 4LN, where L is the distance to the wall and N is the number of claps per second.

(b) What is a reasonable value for L for this experiment to be feasible? (If you have access to a flat wall outdoors somewhere, try this method and compare your result with the standard value for the speed of sound.)

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