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August 30, 2025, 02:13:44 am

Author Topic: Question 10 Sound. Look here if you're unsure.  (Read 8979 times)  Share 

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bomb

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Question 10 Sound. Look here if you're unsure.
« on: November 10, 2010, 03:45:53 pm »
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Heinemann Physics 12 states:

Quote
An increase in the amplitude of the sound wave corressponds to an increase in the volume or loudness of the sound, but the frequency and speed of the sound remain independent of change in volume and amplitude.

So, answer is A?

Also, for the Q where you had to state the LAW, could it be Lenz's law as well?

I mean, Lenz's law tells you the flux generated which in turn lets you use Faraday's Law.
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curious111

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Re: Question 10 Sound. Look here if you're unsure.
« Reply #1 on: November 10, 2010, 03:46:59 pm »
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I really think that the question relating to the law isn't clear enough, and that they should accept either Lenz's or Faraday's.

3Xamz

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Re: Question 10 Sound. Look here if you're unsure.
« Reply #2 on: November 10, 2010, 03:54:09 pm »
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Yeah but at 3000Hz the microphone did not reproduce the sound identically, it had a +3dB change. Hence it was louder at the 3000freq, giving the increased amplitude.

Your definition stands correct but it doesn't account for how its the microphone's fault.

jackchan1993

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Re: Question 10 Sound. Look here if you're unsure.
« Reply #3 on: November 10, 2010, 03:57:09 pm »
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yeah u need to take into account of the response curve of the microphone

bomb

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Re: Question 10 Sound. Look here if you're unsure.
« Reply #4 on: November 10, 2010, 04:00:05 pm »
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lol I can't remember the microphone, I'll have to check the exam :S
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schnappy

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Re: Question 10 Sound. Look here if you're unsure.
« Reply #5 on: November 10, 2010, 04:14:38 pm »
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I really think that the question relating to the law isn't clear enough, and that they should accept either Lenz's or Faraday's.

I said faraday's since I didn't invert my graph in the t-axis. My teacher said you could do either, when we had class tests/SAC. He knows his stuff and is 'friends' with the people associated with the writing of the exam, so I've invested a bit of trust in his knowledge there.

For sound, it was A... amp prop to loudness/intensity/volume (all the same thing in essence), frequency increased. Obviously A. If it isn't, I'mma shit bricks.

Whatlol

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Re: Question 10 Sound. Look here if you're unsure.
« Reply #6 on: November 10, 2010, 04:18:45 pm »
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pretty sure 10 is B
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cypriottiger

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Re: Question 10 Sound. Look here if you're unsure.
« Reply #7 on: November 10, 2010, 04:20:09 pm »
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im just posting so i can get an update when a confirmed answer comes through lol :)
if it mattera i said A and lenz
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jackchan1993

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Re: Question 10 Sound. Look here if you're unsure.
« Reply #8 on: November 10, 2010, 04:21:04 pm »
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pretty sure 10 is B

+1

yeah i think it should be B, it said they were the same intensity, but u had to refer the the graph, and the microphone was more sensitive to the higher frequency sound, so its amplitude had to be higher than the other sound.

3Xamz

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Re: Question 10 Sound. Look here if you're unsure.
« Reply #9 on: November 10, 2010, 04:39:07 pm »
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pretty sure 10 is B

+1

yeah i think it should be B, it said they were the same intensity, but u had to refer the the graph, and the microphone was more sensitive to the higher frequency sound, so its amplitude had to be higher than the other sound.
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cod101

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Re: Question 10 Sound. Look here if you're unsure.
« Reply #10 on: November 10, 2010, 04:44:50 pm »
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c'mon A!

Whatlol

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Re: Question 10 Sound. Look here if you're unsure.
« Reply #11 on: November 10, 2010, 04:46:34 pm »
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B
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superflya

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Re: Question 10 Sound. Look here if you're unsure.
« Reply #12 on: November 10, 2010, 04:47:46 pm »
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C ::)
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bomb

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Re: Question 10 Sound. Look here if you're unsure.
« Reply #13 on: November 10, 2010, 05:03:38 pm »
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Damn, I needed those marks :(
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kazekage

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Re: Question 10 Sound. Look here if you're unsure.
« Reply #14 on: November 10, 2010, 06:36:35 pm »
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Question 10 the answer is definately A because, as the question stated "same intensity" - my thought process is, the amplitude determines the loudness of the sound (higher amplitude = higher energy = loud sound - wave propeties we learnt in light and matter). Therefore same intensity means same amplitude. Thus the only thing that changes is the period. Feel free to critisize but i am fairly certain its A ^____^
« Last Edit: November 10, 2010, 06:38:41 pm by kazekage »