I put resistance would be lower at a lower current because of less heating, so fewer ionic vibrations and less electron-ion collisions. Seems like I was in the minority. Thoughts?

(edited 10 years ago)

Reply 589

mny355

was the circuit on the second last question in series or parallel?

Reply 590

JoshThomas

Original post by GCSE-help

Hi guys. Thought it was a good paper, until it got to the last question :colondollar:

I put resistance would be lower at a lower current because of less heating, so fewer ionic vibrations and less electron-ion collisions. Seems like I was in the minority. Thoughts?

Original post by mny355

was the circuit on the second last question in series or parallel?

I put resistance would be lower for the same reasons you did and in series

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Reply 591

GCSE-help

6

Original post by mny355

was the circuit on the second last question in series or parallel?

Series, because if one bulb went out the other one did too.

Reply 592

frannyw

1

What did everyone get for the multiple choice questions?

Reply 593

jollygood

8

I put it in series too. Okay starting from MCQs what did u put for first two ? I put violin instrument and mgh/VIt

Reply 594

GCSE-help

6

Original post by frannyw

What did everyone get for the multiple choice questions?

I got mgh/VIT for the efficiency, even though some said it was 0.5mv^2/VIT.

I also put superposition for the final MC but apparently it was polarisation. Silly me for not reading the q :frown:

Reply 595

frannyw

1

Original post by GCSE-help

I got mgh/VIT for the efficiency, even though some said it was 0.5mv^2/VIT.

I also put superposition for the final MC but apparently it was polarisation. Silly me for not reading the q :frown:

I did 0.5mv^2/VIT, but assume I'm wrong, and I put superposition too :/

Reply 596

jollygood

8

For last Mcq I put polarization. and for one with angle of incidence and angle or refraction I did 90- whatsoever the angle with horizontal. and angle of refraction was smaller value.

Reply 597

GCSE-help

6

Original post by jollygood

For last Mcq I put polarization. and for one with angle of incidence and angle or refraction I did 90- whatsoever the angle with horizontal. and angle of refraction was smaller value.

Yeah you're right on both counts but could you please remind me about the polarisation question? Are you sure it wasn't superposition? I didn't read the question and hastily ticked superposition after seeing the image.

Also what did you put for the last question?

Reply 598

jollygood

8

Okay and there wasn't any other hard MCQ apart from these two three. now coming to the questions answers first three were fairly okay. For the resistance one in which the real value was double the calculated value I said that by applying force the wire becomes longer as well as thinner so cross sectional area also decreases and for this reason the ressitance is twice the calculated value. what did u guys put?

Reply 599

jollygood

8

Original post by GCSE-help

Yeah you're right on both counts but could you please remind me about the polarisation question? Are you sure it wasn't superposition? I didn't read the question and hastily ticked superposition after seeing the image.

Also what did you put for the last question?

Yeah sure the last mcq was about the two waves passing through thin film of oil and producing many different colours or something like that but it was same diagram as in one of past paper. and it asked which phenomenon isnot involved in producing different colours? it was polarization.

Edexcel Physics Unit 2 "Physics at work" June 2013

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