Problem regarding sounds and waves

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Homework Help Overview

The problem involves sound propagation through different mediums, specifically an iron pipe filled with water and a scenario with air. The original poster seeks to understand the time it takes for sounds to travel through these mediums and whether two sounds will be heard when the pipe is filled with air.

Discussion Character

  • Exploratory, Assumption checking

Approaches and Questions Raised

  • The original poster attempts to apply the formula d=vt but expresses confusion regarding the presence of two sounds and the role of different mediums in sound propagation.
  • Some participants question the fundamental differences between the two scenarios presented in the questions.
  • There is a clarification regarding the length of the pipe in the second question, which may affect the outcome.

Discussion Status

Participants are engaging in a back-and-forth exploration of the problem, with some guidance provided on the first question. However, the second question remains less clear, and further clarification is sought by the original poster.

Contextual Notes

The original poster initially provided incorrect information regarding the length of the pipe in the second question, which may influence the discussion and assumptions being made.

Nazif Farhan
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Homework Statement


An iron pipe is 1200 meters long and is filled with water. If a sound is made at one end of the pipe, two sounds/noises are heard at the other end. If the speed of sound in water is 1450 m/s and the speed of sound in iron is 5220 m/s then
Q(1) : How long is it going to take to hear the second sound at the other end after the first one?
Q(2) : If the pipe is filled with air in which the speed of sound is 340 m/s, will making a sound at one end produce two sounds at the other end?

Homework Equations

The Attempt at a Solution


Well I know that, d=vt and in the case of echo it's 2d=vt but in this case, it's no echo and there are two mediums here which is confusing me and I can't even understand why I'll hear two sounds at other end for the first case.
 
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Nazif Farhan said:
Well I know that, d=vt
That's really all you need.

Nazif Farhan said:
I can't even understand why I'll hear two sounds at other end for the first case
Because sound travels both in the iron of the pipe and in the water filling the pipe.
 
Thanks for the reply Doc Al. Well that solves the first question but you didn't say anything about the second one or maybe you did and I'm not getting it. Please reply, I'm not that bright.
 
What do you think? Compare the second with the first. Any fundamental difference?
 
Oh I'm really really sorry. I left out an important part of the question. In the second question, it should've been 'If the pipe is 400 meters long and if the pipe is filled with air in which the speed of sound is 340 m/s, will making a sound at one end produce two sounds at the other end?'
 

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