Edexcel IAL Physics Unit 2 WPH02 May June 2016 Discussion
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Original post by rxxm
I tried doing that but how can I get Q?
1.6 x 10^-19
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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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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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...
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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Original post by 333777333
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?
Original post by Hamadtype-
E=HF
E=IVT
IVT=HF
IV x1/F = HF
H= [ IV (1/F) ] / F
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
I got the percentage as 1 % something 
Anyone got this ??
Anyone got this ??
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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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%
Original post by NNB_Herath
no man...they have not given the time....
So you must use
E=hf
K.E = Ve
hf = Ve
So you must use
E=hf
K.E = Ve
hf = Ve
1 over the frequency = time?
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%
EFFICIENCY ?
I got something around 1%
4.6% I believe
Original post by NNB_Herath
What did you get for the PERCENTAGE ???
EFFICIENCY ?
I got something around 1%
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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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?😂😂
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
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
Is the answer 40000Hz?
Original post by 12103763d
Is the answer 40000Hz?
Yes
Original post by Pagarani Neelesh
Yes
i got 20000Hz when i worked it out!
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