ATAR Notes: Forum
Archived Discussion => 2010 => End-of-year exams => Exam Discussion => Victoria => Physics => Topic started by: Munkea on November 10, 2010, 01:43:04 pm
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Just posting up my suggested answers. May be a few discrepancies, however I'm pretty confident with these.
1. B
2. D
3. A
4. C
5. C
6. D
7. C
8. C
9. B
10. A
11. A
12. D
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Here are my MCQ answers for sound
1 - B
2- D
3 -A
4 -C
5- C
6 D
7 C
8 C
9 B
10 B
11 A
12 D
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B
D
A
C
C
D
C
C
B
B
A
D
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Was the microphone one just the linear region (I think it was 200-2000)?
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lookin good everyone
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Was the microphone one just the linear region (I think it was 200-2000)?
thats what i put down
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Here are my MCQ answers for sound
hi5~~~~~
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Fk I got 1.c ... There goes a mark
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wasn't the first sound intensity question A, i just subbed in A into the sound intensity formula and it gave me 70db so i went with A??
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yeah its A for the sound intensity one... question 3!
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Here are my MCQ answers for sound
1 - B
2- D
3 -A
4 -C
5- C
6 D
7 C
8 C
9 B
10 B
11 A
12 D
Same here. A lot of my friends at A for question 10.
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Here are my MCQ answers for sound
1 - B
2- D
3 -A
4 -C
5- C
6 D
7 C
8 C
9 B
10 B
11 A
12 D
Same here. A lot of my friends at A for question 10.
yeah i put down A as well coz i was looking at the phon line at the back page, and increase hz to 3000 increases the dB, so i thought it the graph should be decreased since it should be same intensity. lol im not sure. could be wrong. it was defs A or B.
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I put down A aswell because I didn't realise it was part of question 9. I just assumed same intensity=same amplitude. My teacher said it was B
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Just posting up my suggested answers. May be a few discrepancies, however I'm pretty confident with these.
1. B
2. D
3. A
4. C
5. C
6. D
7. C
8. C
9. B
10. A
11. A
12. D
does anyone remember q7? i got B for that
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Fk I got 1.c ... There goes a mark
each detailed study question is worth 2 marks
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B D A C C D C C B A A D
LOOKING GOOD
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1. B 330/512
2. D Oscillates horizontally
3. A 10^7*10^-12=10^-5
4. C 4 times the radius, therefore 16th the intensity, 12 dB change, 58 dB
5. C 50 phon
6. D 330/(4*133)
7. C 3* previous answer
8. C 320/(2*L)
9. B 200-2000Hz is where the graph is flat - fidelity
10.B The period shortens and the amplitude increases because the microphone is more sensitive to 3kHz than 1kHz
11. A Baffleboad prevents out of phase waves from front and back interfering
12. D The tweeter behind the tv cant diffract around the tv
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Q 10 was A.
it said it has the same sound or something along those lines so the amplitude was the same
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I seem to be getting the same as you guys :)
That Q10 was a tricky one considering it didn't seem like it continued on from Q9, had to be paying attention.
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Got the exact same answers as OP
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so was q 10 a continuation of q9 or not? i dont remember
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1. B 330/512
2. D Oscillates horizontally
3. A 10^7*10^-12=10^-5
4. C 4 times the radius, therefore 16th the intensity, 12 dB change, 58 dB
5. C 50 phon
6. D 330/(4*133)
7. C 3* previous answer
8. C 320/(2*L)
9. B 200-2000Hz is where the graph is flat - fidelity
10.B The period shortens and the amplitude increases because the microphone is more sensitive to 3kHz than 1kHz
11. A Baffleboad prevents out of phase waves from front and back interfering
12. D The tweeter behind the tv cant diffract around the tv
for 10, why does the amplitude increase? I'm 100% sure it said that the two soudns were of the same intensity level.
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so was q 10 a continuation of q9 or not? i dont remember
Yeah, it was the same microphone. hence for the same sound intensity reaching the microphone, it would record a higher/lower value depending on frequency.
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10 is A, not B.
kyzoo is right. It said that the intensity was made to be EXACTLY the same after the frequency was changed.
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so was q 10 a continuation of q9 or not? i dont remember
Yeah, it was the same microphone. hence for the same sound intensity reaching the microphone, it would record a higher/lower value depending on frequency.
but that's perceived loudness =/ I thought asme intensity produce same sound level regardless of how we hear it, and regardless of frequency
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so was q 10 a continuation of q9 or not? i dont remember
Yeah, it was the same microphone. hence for the same sound intensity reaching the microphone, it would record a higher/lower value depending on frequency.
but that's perceived loudness =/ I thought asme intensity produce same sound level regardless of how we hear it, and regardless of frequency
Perceived loudness is the phon graphs with hearing. I can't remember the exact question, but it was asking for the value that the microphone obtains (for want of a better word). The microphone obtains a higher value for frequencies it is more sensitive to.
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hmmm haha interesting dispute
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LOL true, interesting dispute
I wrote A first, then changed it when i realised that Q10 followed on from Q9
It said that the sound intensity was exactly the same when it reached the microphone
And the question said what would be read on the oscilloscope
And cos the y axis was in arbitrary units, the amplitude would be much higher. Cos at 1khz, the graph on the page prior had the output of the microphone at 0dB and at 3khz as +6dB.
So i figure the oscilloscope would have a higher output when its 3khz as opposed 1khz, even though the intensity was the same.
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it was intensity level not phon though. so it should be A because it says the intensity level stays the same.
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The microphone is not of equal fidelity at 1000 and 3000 Hz though, so on the CRO display the 3000 Hz sound will have greater amplitude I believe...so B.
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Phon has nothing to do with this question.
Intensity is measured in Wm^-2
So at the microphone, the intensity is the same.
And the reading on the oscilliscope which is attached to the microphone would vary with the frequency because the microphone is more sensitive to 3kHz than it is to 1kHz
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hold up isnt fidelity when the graph is higher above 0??
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I said A for question 10 as the question stated that the intensity levels had to stay the same. Just seemed like the logical answer.
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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.