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# Edexcel IAL Physics Unit 2 WPH02 May June 2016 Discussion

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1. (Original post by rxxm)
I tried doing that but how can I get Q?
1.6 x 10^-19
2. (Original post by 12103763d)
C..
But the path difference was 1cm so that's a constructive interference point, shouldn't it be D) in phase?

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3. (Original post by rxxm)
I tried doing that but how can I get Q?
You just use E=hf, use the voltage given and multiply it by 1.6 x 10^-19 for E.

The final answer for h was 6.3 x 10^-34 I think

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4. (Original post by 333777333)
But the path difference was 1cm so that's a constructive interference point, shouldn't it be D) in phase?

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But its wavelength is 2cm if I did not forget...
5. (Original post by 12103763d)
But its wavelength is 2cm if I did not forget...
Are you sure they stated a wavelength?

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6. (Original post by 333777333)
Are you sure they stated a wavelength?

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If u don't know what wavelength it is, how come u can figure out it is constructive interference lol does anybody know the answer of this mcq?
E=HF
E=IVT
IVT=HF
IV x1/F = HF
H= [ IV (1/F) ] / F
no man...they have not given the time....

So you must use

E=hf
K.E = Ve

hf = Ve
8. I got the percentage as 1 % something

Anyone got this ??
9. (Original post by 333777333)
You just use E=hf, use the voltage given and multiply it by 1.6 x 10^-19 for E.

The final answer for h was 6.3 x 10^-34 I think

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What did you get for the PERCENTAGE ???
EFFICIENCY ?

I got something around 1%
10. (Original post by NNB_Herath)
no man...they have not given the time....

So you must use

E=hf
K.E = Ve

hf = Ve
1 over the frequency = time?
11. (Original post by 333777333)
Are you sure they stated a wavelength?
Yeah it was given and the answer was C anti-phase

(Original post by NNB_Herath)
What did you get for the PERCENTAGE ???
EFFICIENCY ?

I got something around 1%
4.6% I believe
12. (Original post by NNB_Herath)
What did you get for the PERCENTAGE ???
EFFICIENCY ?

I got something around 1%
Are you referring to the percentage efficiency of the other question? Including the emf and stuff? That was 4. Something %

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13. (Original post by ahnafhaque)
Damn yeah I got 8333HZ apparantly I took the small division (which is wrong) so yeah we are on the same boat and it has a hole xD
U did get that from Steve jobs didn't u?😂😂
14. For all those who got 8333 don't worry u will still get one mark for using the correct equation secondly pls don't complain about the division as frequency 8333 is no ultrasound it should be at least 20000
15. (Original post by Pagarani Neelesh)
For all those who got 8333 don't worry u will still get one mark for using the correct equation secondly pls don't complain about the division as frequency 8333 is no ultrasound it should be at least 20000
16. (Original post by 12103763d)
Yes
17. (Original post by Pagarani Neelesh)
Yes
i got 20000Hz when i worked it out!
18. Unofficial marking scheme for this unit is available from phymathtutor, what the minimum grade boundary for an A do you think after checking?

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