An explosion occurs at the end of a pier. The sound reaches theother end of the

Question

An explosion occurs at the end of a pier. The sound reaches theother end of the pier by traveling through three media: air, freshwater, and a slender metal handrail. The speeds of sound in air,water, and the handrail are 343, 1482, and 5040 m/s, respectively.The sound travels a distance of 115 m ineach medium. (a) Through which medium does the sound arrivefirst, second, and third?
(No Response) (first)
(No Response) (second)
(No Response) (third)

(b) After the first sound arrives, how much later do the second andthird sounds arrive?
4(No Response) s (second sound)
5(No Response) s (third sound) (a) Through which medium does the sound arrivefirst, second, and third?
(No Response) (first)
(No Response) (second)
(No Response) (third)

(b) After the first sound arrives, how much later do the second andthird sounds arrive?
4(No Response) s (second sound)
5(No Response) s (third sound)

Explanation / Answer

The speeds of sound in air v = 343 m / s
The speed of sound in water v ' = 1482 m / s The speed of sound in handrail v " = 5040m/s Distance travel S = 115 m (a).If the speed of sound is greater then it arrivesfirst So, first : handrail second : water third : air (b). time taken to travel through handrail t = S / v                                                                = 0.0228 s timetaken to travel through water t ' = S / v '                                                        =0.07759 s timetaken to travel through air t " = S / v "                                                    = 0.33527 s time interval between 1 st and 2 nd is t ' - t = 0.05479s timeinterval between 3 rd and 1 st is t" - t = 0.31247 s

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