234UncleBob
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Many Thanks In advance to whoever replies!

Question 1c)
https://pmt.physicsandmathstutor.com...ystem%20QP.pdf

Mark Scheme:
https://pmt.physicsandmathstutor.com...ystem%20MS.pdf

ear more sensitive (than Io) for a range of frequencies between 1
and about 2 6 kHz (1)

- How are we meant to know that, is here a graph that shows that, a link would be useul.

Many Thanks!
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The Trut
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(Original post by 234UncleBob)
Many Thanks In advance to whoever replies!

Question 1c)
https://pmt.physicsandmathstutor.com...ystem%20QP.pdf

Mark Scheme:
https://pmt.physicsandmathstutor.com...ystem%20MS.pdf

ear more sensitive (than Io) for a range of frequencies between 1
and about 2 6 kHz (1)

- How are we meant to know that, is here a graph that shows that, a link would be useul.

Many Thanks!
Oh, hello again!
Yeah this question is quite weird but only because of the second part. The first part makes sense as "dBA" is just an adjusted version of decibels whereby higher and lower frequencies are made quieter to suit the human ear and prevent damage. You do need to know that the range of human hearing is between 20-20000 Hz. However, the fact that the ear is more sensitive to frequencies between 1-2.6KHz is something I hadn't seen before.
Sorry I couldn't be of much use!
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234UncleBob
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(Original post by The Trut)
Oh, hello again!
Yeah this question is quite weird but only because of the second part. The first part makes sense as "dBA" is just an adjusted version of decibels whereby higher and lower frequencies are made quieter to suit the human ear and prevent damage. You do need to know that the range of human hearing is between 20-20000 Hz. However, the fact that the ear is more sensitive to frequencies between 1-2.6KHz is something I hadn't seen before.
Sorry I couldn't be of much use!
Hey!
No worries, Thanks!
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234UncleBob
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(Original post by 234UncleBob)
Hey!
No worries, Thanks!
Another Question, if you've got time.


For example, lets say a question says V is increased in a circuit, how is current and resistance affected?

Using the equation V=IR you know that V ∝ I and also V ∝ R.
So increasing V, Increases I and Increases R,

but from the equation, we know I is ∝ 1/R, so if one of the values of I or R increases, the other value decreases. E.g Current increases therefore Resistance Decreases, but this doesn't agree with the previous statement.

So which one is true and how do you work this out for other equations as well??? (The v=ir was an easy general example)
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