Question

Sound travels through air at about 344 meters per seconds when the temp. is 20 degrees c. If Enrique lives 2 kilometres from the fire station and it takes 5 seconds of the fire station siren to reach him, how can you prove indirectly that it's not 20 degrees Celsius when Enrique hears the siren?

Answer 1

The temperature at the time the siren sounded is not 20 degrees c because, the speed of the siren sound is 400 meters per second, contrary to the speed of sound at 20 degrees c, 344 meters per seconds.

According to the question:

• At 20 degrees c, sound travels throughout air at about 344 meters per seconds.

However, Enrique's house is 2 kilometres from the station and it takes 5 seconds for the fire station siren to reach him.

In essence, the speed of the siren sound is;

Speed = 2,000/5 = 400 meters per second.

Ultimately, since the speed of the siren sound is 400 meters per second, contrary to the speed of sound at 20 degrees c, 344 meters per seconds.

We can conclude that the temperature is not 20 degrees c.

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