Edexcel Unit 2: Physics at Work ~9th June 2014

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it is but you would of thought that they were expecting another answer other than 0, which is too obvious, thats why i wrote down Lambda and 360 degreese

Is it okay to write it in radians?

Reply 781

bobo19966

Original post by 'nicole

Is it okay to write it in radians?

phase difference is measured in radians so yes

Reply 782

cerlohee

Original post by bobo19966

Much better than the previous past paper as they don't ask any calculations about pd or resistance in an circult which is my weakest part :tongue:

I'm the opposite! I spent ages learning it and really wanted it to come up haha.

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Reply 783

MrHogwash

See, told you. Was a decent paper, wasn't it? :smile:

Reply 784

chermaine123

if I wrote constructive and destructive interference for the chocolate question, will my marks be deducted ?

Reply 785

bobo19966

Original post by cerlohee

I'm the opposite! I spent ages learning it and really wanted it to come up haha.

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I also learn this for ages but I still don't understand how to calculate them till today but anyway they just come up calculate the internal resistance in multiple choice :biggrin:

Reply 786

MrHogwash

Original post by cerlohee

I'm the opposite! I spent ages learning it and really wanted it to come up haha.

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Same here. Revised so much for electricity. Was disappointed not much of came up. The grade boundaries will go up thanks to this.

Reply 787

PBatch

Original post by chermaine123

if I wrote constructive and destructive interference for the chocolate question, will my marks be deducted ?

No. This is actually correct. Look at 18b. on this markscheme.
http://www.edexcel.com/migrationdocuments/QP%20GCE%20Curriculum%202000/GCE%20January%202010%20-%20MS/6PH02-01-MS-1001.pdf

It's the same question and talks about constructive interference when waves are in phase and destructive interference when waves are out of phase.

Reply 788

katieskiier

What did everyone write for the 6 mark raindrop and also the raindrop calculation (between 5km and 200km away)??

Reply 789

Kaneda

I got 180 degrees for the phase difference
They were exactly one wavelength apart

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Reply 790

bobo19966

Original post by MrHogwash

See, told you. Was a decent paper, wasn't it? :smile:

it is fine the only thing that I can't do is calculating the phase difference in chocolate question as I forget how to. so i just simply wrote pi/2

Reply 791

MrHogwash

Original post by chermaine123

if I wrote constructive and destructive interference for the chocolate question, will my marks be deducted ?

Kind of. The question was to relate the cold points with the hot points. Again, these points had nothing do with the temperature of the chocolate but rather how constructive interference causes hot points and destructive causes cold points.

Reply 792

Karoel

Original post by katieskiier

What did everyone write for the 6 mark raindrop and also the raindrop calculation (between 5km and 200km away)??

I got 3.33x10^-5 s for the pulse duration but I'm not sure if that's right :s-smilie:

Reply 793

katieskiier

Original post by Karoel

I got 3.33x10^-5 s for the pulse duration but I'm not sure if that's right :s-smilie:

How did you work that out? I got 6.4 x 10^-4 but im pretty sure im wrong! :frown:

Reply 794

Schraderrr

Guys just started a Forum for the Unit 4 paper coming up, just some simple discussion on what could come up and a resource if you need any help with revision!

Check it out!

http://www.thestudentroom.co.uk/showthread.php?t=2707581

Reply 795

MrHogwash

Original post by Karoel

I got 3.33x10^-5 s for the pulse duration but I'm not sure if that's right :s-smilie:

Me too mate. :smile:

Reply 796

PBatch

Original post by Karoel

I got 3.33x10^-5 s for the pulse duration but I'm not sure if that's right :s-smilie:

I believe this is correct. Min. distance * 2 = 5 * 2 = 10 km. This equates to 10000 m.

Time = Distance / Speed = 10,000 / 300,000,000 = 3.33 * 10^-5 seconds.

Reply 797

MrHogwash

What did you guys write for the laser passing through a slit that was getting more narrow? I stupidly wrote about the particle theory :frown:

Reply 798

PBatch

Original post by MrHogwash

What did you guys write for the laser passing through a slit that was getting more narrow? I stupidly wrote about the particle theory :frown:

What is being observed is diffraction.
As the aperture gets narrower it's size becomes closer to that of the wavelength of light. Therefore the light diffracts more, this means it is spread over a wider area.