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Category > Physics Posted 23 May 2017 My Price 6.00

A geologist

A geologist is camped 11,312 m (about 7 miles) from a volcano as it erupts.

 

(a) How much time elapses before the geologist hears the sound from the eruption? (Assume the air temperature is 20°C.)

 

 

(b) How much time does it take the seismic waves produced by the eruption to reach the geologist's camp, assuming the waves travel along the surface through granite as sound waves do? (Assume the granite temperature is 20°C.)

 

 

and

 

 

A person stands at a point 368 m

in front of the face of a sheer cliff. If the person shouts, how much time will elapse before an echo is heard? (Assume the speed of sound is 344 m/s.)

 

 

and

 

 

The sound level measured in a room by a person watching a movie on a home theater system varies from 60 dB

during a quiet part to 90 dB during a loud part.

Approximately how many times louder is the latter sound? (enter only a number as your answer)

times

Answers

SuperTutor
(15)
Status NEW Posted 23 May 2017 01:05 AM My Price 6.00

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