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September 25, 2025, 07:53:11 pm
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Author Topic: Sound  (Read 4029 times)  Share 

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Chavi

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Sound
« on: November 10, 2010, 03:05:46 pm »
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How'd everyone find it? I thought it was relatively straightforward (except for 1 question).
here are my answers (off the top of my head)

1.B
2.D
3.A
4.C
5.C
6.D
7.C
8.C
9.A (not sure about this one, becuase the flat region was at 0DB)
10.B
11.A
12.D
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nehcrow

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Re: Sound
« Reply #1 on: November 10, 2010, 03:11:00 pm »
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wasn't question 9 from 2000 hz - 10000 hz? i thought that was pretty straight forward
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Chavi

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Re: Sound
« Reply #2 on: November 10, 2010, 03:11:59 pm »
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Quote from: nehcrow on November 10, 2010, 03:11:00 pm
wasn't question 9 from 2000 hz - 10000 hz? i thought that was pretty straight forward
But the debate is whether the flat part is included or not. . .
I also had D originally, but the next question follows on with a 1000 hz response, thus eliminating D)
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SixWinged

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Re: Sound
« Reply #3 on: November 10, 2010, 03:15:40 pm »
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It's B I believe, fidelity is the flat region. The decibel values are relative, a response of 0db simply means it's equal intensity to whatever they measured it against.
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Re: Sound
« Reply #4 on: November 10, 2010, 03:16:43 pm »
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Quote from: SixWinged on November 10, 2010, 03:15:40 pm
It's B I believe, fidelity is the flat region. The decibel values are relative, a response of 0db simply means it's equal intensity to whatever they measured it against.

That is what I got as well. You just had to give the range of the flat region.
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nehcrow

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Re: Sound
« Reply #5 on: November 10, 2010, 03:17:17 pm »
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ok, what answer was B?
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SixWinged

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Re: Sound
« Reply #6 on: November 10, 2010, 03:18:15 pm »
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9
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Chavi

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Re: Sound
« Reply #7 on: November 10, 2010, 03:19:49 pm »
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Right, but there was better response for 2000 - 10000 herz
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nehcrow

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Re: Sound
« Reply #8 on: November 10, 2010, 03:21:24 pm »
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yes, but what was correct range exactly? 2000 - 10000 hertz or something else?
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m@tty

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Re: Sound
« Reply #9 on: November 10, 2010, 03:22:22 pm »
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Quote from: Chavi on November 10, 2010, 03:05:46 pm
How'd everyone find it? I thought it was relatively straightforward (except for 1 question).

What was question 1? I can't remember it...
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SixWinged

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Re: Sound
« Reply #10 on: November 10, 2010, 03:22:29 pm »
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Fidelity is about a consistent response. A microphone that responds very well to 10,000Hz but poorly to 9,000Hz is useless as changing frequency slightly would also change the volume. You can always turn the microphone up super high if it's too low, so long as the intensity is constant for all frequencies.
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Re: Sound
« Reply #11 on: November 10, 2010, 03:23:49 pm »
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haha . wasn't question one like speed over wavelength or frequency to get the other one?
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Chavi

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Re: Sound
« Reply #12 on: November 10, 2010, 03:24:37 pm »
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Quote from: m@tty on November 10, 2010, 03:22:22 pm
Quote from: Chavi on November 10, 2010, 03:05:46 pm
How'd everyone find it? I thought it was relatively straightforward (except for 1 question).

What was question 1? I can't remember it...
Question 1:
Find the wavelength. Speed of sound = 330m/s, f=512 hz
Lamda = 33/512 = 0.64 so, option B
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m@tty

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Re: Sound
« Reply #13 on: November 10, 2010, 03:25:13 pm »
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Quote from: SixWinged on November 10, 2010, 03:22:29 pm
Fidelity is about a consistent response. A microphone that responds very well to 10,000Hz but poorly to 9,000Hz is useless as changing frequency slightly would also change the volume. You can always turn the microphone up super high if it's too low, so long as the intensity is constant for all frequencies.

This.

Fidelity is about having consistent response over a range of frequencies, I believe.


EDIT:
Quote from: Chavi on November 10, 2010, 03:24:37 pm
Quote from: m@tty on November 10, 2010, 03:22:22 pm
Quote from: Chavi on November 10, 2010, 03:05:46 pm
How'd everyone find it? I thought it was relatively straightforward (except for 1 question).

What was question 1? I can't remember it...
Question 1:
Find the wavelength. Speed of sound = 330m/s, f=512 hz
Lamda = 33/512 = 0.64 so, option B

So why was it tricky??
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Chavi

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Re: Sound
« Reply #14 on: November 10, 2010, 03:27:09 pm »
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Not question 1 - but one of the question (q9)
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