Sorry it's so wordy, my professor's..... well he likes wordy problem's I guess.(adsbygoogle = window.adsbygoogle || []).push({});

1. The problem statement, all variables and given/known data

I have very bad acoustics in my gym, where I have a sound system.

To model my gym’s sound system, imagine that the gym is a

cube 4m in length on each side. It’s empty, and the floor, walls,

and ceiling are perfectly flat and reflect sound perfectly (an acoustical

worst‐case scenario!). As a result, its boundary condition is

that any sound wave is always zero at the floor, walls, and ceiling.

Compute the longest sound wavelength that the room can support

and its frequency (recall that the speed of sound is 350m/s). Write

down an expression for all the wavelengths and frequencies that

the room can support.

Now imagine that you’re standing with your head precisely at the

center of the room, and notice that you’re at a “node” for some frequencies

and so won’t be able to hear them. Which frequencies

are those? If you’ve ever been in a theater with poor acoustics,

where your friends beside you could hear fairly well but you

couldn’t, you’re probably familiar with this effect.

2. Relevant equations

d=vt, v=Lf, (L=lambda) and maybe harmonics.

3. The attempt at a solution

So far, my idea is to basically useV=Lfand plug in the room length to somehow find the frequency and period of the biggest possible wave the room can hold. Then, find it's harmonics. But is this the right approach?

Thanks.

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# Homework Help: Setting up a sound system

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