Jacques is investigating the speed of sound in a lab. A speaker is placed 30
metres away from a sensor. The speaker produces a short pulse of sound that is
detected by the sensor. The sensor measures time since the pulse was produced
to the nearest hundredth of a second. Jacques writes down how long it took
the sound pulse to reach the sensor and uses this to calculate its speed.
(a)
Jacques wants to measure the speed of light. He decides to do the
same experiment, but replace the speaker with a light source and chance
the settings of the sensor so that it detects light instead of sound.
Explain the problem with the results that he'll get from this experiment.