A geologist is camped 8,000 m from a volcano as it erupts. a) How much time elap

Question

A geologist is camped 8,000 m from a volcano as it erupts.

a) How much time elapses before the geologist hears the sound from the eruption? Discuss what we are assuming about the propagation of the wave.
THIS IS WHAT I GOT FOR A)

a) 8000/343 = 23.32 sec (speed of sound is approximately 23.32sec
Propagation of wave is in vacuum, no compression etc
The "speed of propagation" is the hamiltonian !
Note that the wave function doesn't live in real space, and hence you cannot define such a thing as "speed of propagation" of the wave function in things like meters per second or so. The wave function lives in Hilbert space.

PART B IS WHAT I AM HAVING ISSUES WITH. INSTRUCTOR KEEPS COMING BACK AND ASKING ME TO ANSWER. PAY ATTENTION TO THE GRANITE??????? HELP. I think part a) is correct help with b.

b) How much time does it take the seismic waves produced by the eruption to reach the geologist's camp, assuming the waves travel through GRANITE as sound waves do. Discuss why the speed of a wave changes when they go through different materials...???????????????????

Please help.Instructor says a is correct but my b answer is incomplete.

Explanation / Answer

the time taken depends upon the speed of sound in ground . if it was V then the time taken will be t = 8000/V

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