Biology: Magnification Watch

FoOtYdUdE
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Hi there,

Could someone please explain how 187.5 is the answer to QUESTION 1) C) II) ??

...I'd really appreciate it; reps. on offer. :o:

http://store.aqa.org.uk/qual/gceasa/...W-QP-JUN06.PDF

Taa. x
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LadySmythe
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Tbh, without a hard copy of the paper you can't really so this question coz you need to measure the diameter of the image with ruler

Magification = size of image/ size of object

Both have to be in the same units too
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FoOtYdUdE
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(Original post by Loz17)
Tbh, without a hard copy of the paper you can't really so this question coz you need to measure the diameter of the image with ruler

Magification = size of image/ size of object

Both have to be in the same units too
Well it's in pdf format. So... let the size of the page = 100%
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FoOtYdUdE
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Anyhow, if you want the measurements. I got, length of the hiv diagram to be 67mm. The length of the scalebar = 17mm.

Erm does that help?
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LadySmythe
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The pixels might be different. Is there a mark scheme available so I can actually get the correct figure, coz I don't want to give you the wrong advice
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LadySmythe
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(Original post by FoOtYdUdE)
Anyhow, if you want the measurements. I got, length of the hiv diagram to be 67mm. The length of the scalebar = 17mm.

Erm does that help?
It does, thank you. I'll post back in about 2 mins ok?
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FoOtYdUdE
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(Original post by Loz17)
It does, thank you. I'll post back in about 2 mins ok?
Thanks a lot.

http://store.aqa.org.uk/qual/gceasa/...W-MS-JUN06.PDF = markscheme...it's quite vague tbh.
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LadySmythe
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Ok from MS, HIV virus = 80 nm

so 15/80 x 1000 = 187.5

or 15,000/80 = 187.5

Theres a convertion into micrometres from nm
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FoOtYdUdE
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Yes, but how do you get 80 without referring to the mark scheme?
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LadySmythe
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(Original post by FoOtYdUdE)
Yes, but how do you get 80 without referring to the mark scheme?
I'm assuming, with a hard copy, the diameter of the virus = 4 of the scale bars, with is totaled to 80nm

Then for micrometres into nm, its 15 x 1000

Hope thats helps
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LadySmythe
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Btw thanks for the rep . I've added you to my list so you'll get rep in a few days time
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FoOtYdUdE
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Ohhhhhh..

68mm/17mm = 4mm

Therefore...4 x 20 = 80

and so 15000 / 80 = 187.5

Awww thanks a lot! I've repped yer. taa
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Know_your_enemy
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Hi, I was wondering if someone could help me out with a similar question:

http://www.ocr.org.uk/Data/publicati...tion_Paper.pdf

Magnification questions really aren't my forte. I know the formula but I keep getting the wrong answer
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LadySmythe
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(Original post by Know_your_enemy)
Hi, I was wondering if someone could help me out with a similar question:

http://www.ocr.org.uk/Data/publicati...tion_Paper.pdf

Magnification questions really aren't my forte. I know the formula but I keep getting the wrong answer
What question wat it?

:five: for OCR :p:
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LadySmythe
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This is a difficult one, this is the exact paper I took 1st time too, got a C in it

Warning, the grade boundries are so low for this one lol
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Randy2008
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Hi Know_your_enemy,

With your Mag question, what formula you are using is Magnification=IMAGE/object.

The scale shows 25um measuring the scale with MM ruler it is 35mm, I think not got a paper, using computer pdf.

Now it's 35mm (above) 25.

you need to x 35 by a 1000 = 35000/25=1400 magnification by my measurement.
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LadySmythe
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(Original post by Randy2008)
Hi Know_your_enemy,

With your Mag question, what formula you are using is Magnification=IMAGE/object.

The scale shows 25um measuring the scale with MM ruler it is 35mm, I think not got a paper, using computer pdf.

Now it's 35mm (above) 25.

you need to x 35 by a 1000 = 35000/25=1400 magnification by my measurement.
Thats the right answer according to MS, I was trying to find the measurement earler coz I had no ruler or paper version
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Randy2008
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Who's doing AQA Unit 1here then on the 1st June? Bit unaware of what past materials are best other than the specimen.
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LadySmythe
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#19
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(Original post by Randy2008)
Who's doing AQA Unit 1here then on the 1st June? Bit unaware of what past materials are best other than the specimen.
I think OP is on AQA, but that looked like human biology when I looked at the paper, the rest of us are OCR

I'm only doing A2 papers in june
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Know_your_enemy
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(Original post by Randy2008)
Hi Know_your_enemy,

With your Mag question, what formula you are using is Magnification=IMAGE/object.

The scale shows 25um measuring the scale with MM ruler it is 35mm, I think not got a paper, using computer pdf.

Now it's 35mm (above) 25.

you need to x 35 by a 1000 = 35000/25=1400 magnification by my measurement.
Thanks a lot! I know exactly where I went wrong now :o: :yep:
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