Question 10 Sound. Look here if you're unsure.

[3Xamz]

Yeah sure that's the original sound though. However, the reading on the oscilloscope is read AFTER going through the microphone. Which does not reproduce both frequencies with the same intensity.

[Xavier1234]

C

lol you cracked me up

[minimum]

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.

BAHHHAA i wrote Faraday's law first.
Then read the question again and saw the "PHYSICAL" and that put me off.
I ended up writing Right hand palm rule.

DAMNNN.

[Whatlol]

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.

BAHHHAA i wrote Faraday's law first.
Then read the question again and saw the "PHYSICAL" and that put me off.
I ended up writing Right hand palm rule.

DAMNNN.

if it makes you feel better i wrote conservation of energy, the physical law tripped me too )=

[3Xamz]

Yeah wtf that three me off too!
But I couldn't strafe away from the ideal of Faraday's Law, so I just described it instead of stating it. Saying that a changing magnetic field would induce a voltage =[

Oh well, guess we'll both lose the one mark T__T

[thiba17]

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 ^____^

I remember the question stating that both frequencies have the same intensity level "at the microphone" (i.e. where the sound enters the mic) therefore I am pretty sure that B is the correct answer.

[rubiks]

Maybe if we complain enough they'll make both answers right!

[Whatlol]

I honestly feel that when they said the same sound intensities, that is a trap to lure you into choosing A

[bomb]

I'm swayed. Answer's B.

[schnappy]

Yeah sure that's the original sound though. However, the reading on the oscilloscope is read AFTER going through the microphone. Which does not reproduce both frequencies with the same intensity.

I don't recall this question clearly, but did it say the microphone was connected to the oscilloscope? You can hook up signal generators to oscilloscopes, you know...

But if you're right then that makes sense. I don't recall observing there being ANY link between two questions in sound other than the dB one. Aww...

[3Xamz]

I'm pretty sure they said "Refer to this diagram for Question 9-10"

If not, then your arguments are right and its A.
The only reason I chose B because that was a follow up question ><

[Davoo!]

I don't remember what I chose but I chose the one with the higher amplitude and a shorter period.

Hope that's right.

As for the law, I bloody wrote Lenz's. FML.

[schnappy]

I don't remember what I chose but I chose the one with the higher amplitude and a shorter period.

Hope that's right.

As for the law, I bloody wrote Lenz's. FML.

I wouldn't be surprised if they accepted both. On the formula sheet they do cite Lenz's Law as V = -n(d[fi]/dt) don't they? So if you did invert the graph it'd make sense. I went with Faraday's because I didn't invert my graph, as per my teacher (former markerer person) it doesn't matter and he'd accepted mine as rightin SACs.

[Whatlol]

I don't remember what I chose but I chose the one with the higher amplitude and a shorter period.

Hope that's right.

As for the law, I bloody wrote Lenz's. FML.

I wouldn't be surprised if they accepted both. On the formula sheet they do cite Lenz's Law as V = -n(d[fi]/dt) don't they? So if you did invert the graph it'd make sense. I went with Faraday's because I didn't invert my graph, as per my teacher (former markerer person) it doesn't matter and he'd accepted mine as rightin SACs.

pretty sure you have to invert the graph.

[Davoo!]

Are you guys talking about early on in the exam in the first section for the 1 mark? It asked "who's law" thingy? Yeah for that I wrote Lenz's. Just trying to make sure we're talking about the same question.