Concept explainers
In an Olympic competition, a microphone picks tip the sound of the starter’s gun and sends it electrically to speakers at every runner’s starting block. Why?
To determine why the sound from starter’s gun is sent electrically to speakers at every runner’s starting block.
Answer to Problem 27A
This is done to avoid the delay between the gunfire and sound heard by the runners.
Explanation of Solution
Introduction:
Sound travels with a speed 340 m/s, which is much slower than that of electricity.
As the sound travels, slower runners do not hear the starter gunfire the moment it is fired. The delay in hearing the gunfire can be reduced by converting sound to electrical signal, as electricity travels much faster than sound.
Conclusion:
The sound from starter’s gun is sent electrically to speakers at every runner’s starting block to avoid the delay between the gunfire and sound heard by the runners.
Chapter 26 Solutions
Conceptual Physics: The High School Physics Program
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