OCR Physics Unit 2 - G482 - (June Exams Preparation) Watch

MelissaW_xo
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#561
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#561
(Original post by hannahsm)
I got 80% too!


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Me too
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MelissaW_xo
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#562
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#562
(Original post by Gcayte)
I hated the speaker question with the receiver R
There was lots of 3/4 marks where I could only think of 2 points :/
The only thing I liked were the show that so and so equals this
Me too - with the Receiver being turned 90deg that confused me a lot..
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Gcayte
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#563
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#563
(Original post by R4ch3l)
Absolutely h a t e d that paper. Hope the grade boundaries are low! Didn't know how to do the one where the battery takes 7 hours to recharge. How did you guys do it?


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It seems most people hated it hopefully low low boundaries!
I was stuck for ages then used Q=It and it gave the right value, not sure if it was the right think to do?
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MelissaW_xo
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#564
Someone said that because there were lots of 'explain' questions (which people are not very good at answering) the grade boundaries may be lower!
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Gcayte
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(Original post by MelissaW_xo)
Someone said that because there were lots of 'explain' questions (which people are not very good at answering) the grade boundaries may be lower!
Im thinking it'll be as low as 63ish for an A.
As a year 13, that paper was harder than the A2 stuff!
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John Dogg
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#566
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#566
(Original post by 3chainz)
yeah i got 3600 and 720 too.

What did everyone put for the receiver R thing when it's moved by 0.75 cm?

I remember saying that they have an odd number of wavelength (quarter of wavelength) and so destructive interference etc etc..

did everyone write that? :confused:
I thought it was when path difference of a half wavelength not quarter ?
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JG1027
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#567
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#567
did anyone get 2.7m for the new wavespeed when there were the constant thingys
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John Dogg
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#568
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#568
(Original post by JG1027)
did anyone get 2.7m for the new wavespeed when there were the constant thingys
i just doubled the wavelength ? i thought it said T was increased by 4 so v must have increased by x2 as well. so in wave speed equation wavelength also goes up x2 as frequency was kept the same ?
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3chainz
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#569
(Original post by John Dogg)
I thought it was when path difference of a half wavelength not quarter ?
the wavelength was 3 cm though, so i thought 0.75cm was a quarter of it!! aaahhh am i wrong? how did you get half?
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Gcayte
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(Original post by John Dogg)
i just doubled the wavelength ? i thought it said T was increased by 4 so v must have increased by x2 as well. so in wave speed equation wavelength also goes up x2 as frequency was kept the same ?
I doubled wavelength, got 1.2 I think?
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Kent12
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#571
I didn't think it was that bad, although I didn't get the time charging the car battery. What did people get as the speed of the point (W I think) on the wave with the relationship v=krootT?


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John Dogg
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#572
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#572
(Original post by 3chainz)
the wavelength was 3 cm though, so i thought 0.75cm was a quarter of it!! aaahhh am i wrong? how did you get half?
My bad I must have read the question wrong then i didn't know the wavelength was 3cm. i thought they went from maximum to minimum and to do that they moved 0.75. so 0.75cm must be half a wavelength.

This Paper was soo hard that i even botched the simple answers up like the show that questions -_-
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yodawg321
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#573
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#573
Electrcity section was alright, Wave section was a *****
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OllieGCSEs
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#574
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#574
(Original post by Kent12)
I didn't think it was that bad, although I didn't get the time charging the car battery. What did people get as the speed of the point (W I think) on the wave with the relationship v=krootT?


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I put 0.94ms^-1 again, because i said that as K and rootT are constant, the speed would remain the same (the wavelength would change)


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Gcayte
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#575
(Original post by Kent12)
I didn't think it was that bad, although I didn't get the time charging the car battery. What did people get as the speed of the point (W I think) on the wave with the relationship v=krootT?


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I doubled it, no idea what to do got 1.88 I think?
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John Dogg
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#576
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(Original post by OllieGCSEs)
I put 0.94ms^-1 again, because i said that as K and rootT are constant, the speed would remain the same (the wavelength would change)


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This makes sense, so i think this is right.
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OllieGCSEs
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#577
(Original post by John Dogg)
This makes sense, so i think this is right.
Do you know of anyone else who agrees?


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yodawg321
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#578
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#578
I counted that I got 60-65 marks.. Please low boundaries!
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yodawg321
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#579
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#579
Did anyone put Gamma Rays for the wave last question?
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John Dogg
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#580
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#580
(Original post by OllieGCSEs)
Do you know of anyone else who agrees?


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nope, but I think it makes more sense than what i said because i completely failed to mention the v=krootT equation and just said frequency doubled so speed must also double from the v=fxwavelength equation.
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