Measuring the Speed of Sound COPY Measuring the Speed of Sound 22/04/2017 Distance (d) Microphone 2 Microphone 1 timer start stop Make a sound. When the sound reaches microphone 1, the timer starts. When the sound reaches microphone 2 the timer stops giving a time, t, to cover distance, d. The speed of sound can then be calculated from speed = d / t

Results distance (d) = time (t1) = time (t2) = time (t3) = Calculations av. time (t) = d = t = s =

Conclusion The speed of sound is ______________ m/s.

Open up your notes at page 1, note ,The speed of sound and light, and collect a highlighter or coloured pen. timer metre stick noise starts stops mic. 2 mic. 2 340 8 300 000 000

Open up your jotter. Write the heading sound time lightning faster Open up your jotter. Write the heading Examples that show that light travels faster than sound. 1. 2.

or km s or h ms-1 or kmh-1 t = 0.6 s v = 340 ms-1 d = ? d = v x t = 340 x 0.6 = 204 m Problems on page 2.