The Speed of Sound Through the Ground Is About 6

question 74

Multiple Choice

The speed of sound through the ground is about 6.0 km/s while the speed of sound in air is 343 m/s.A very powerful explosion occurs some distance away and you feel the ground vibrate 60 seconds before you hear the sound of the explosion.How far away is the explosion?

• A)20 km
• B)22 km
• C)25 km
• D)27 km
• E)30 km

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