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(WPH14) IAL Physics Unit 4- 11 January 2021 (Exam discussion)

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Original post by Äries
The charge is 4.80x10^-19, i.e. three electron charge.

yass me too!
Original post by ilovephysmath
I'm not sure if mine is correct though

why did u introduce de broglie? the question was not on diffraction or investigating the structure of nucleus..
Original post by Ammar Zavahir
I got 0.26.... i think you forgot about the trigonometric ratio (sin43 or cos43)

yes same here
riyadh

Original post by ilovephysmath
I live in the middle east. not UAE but close. what about you?
ay

Original post by Ammar Zavahir
yass me too

yas mine was correct
what about the relativity question?
Original post by Ammar Zavahir
why did u introduce de broglie? the question was not on diffraction or investigating the structure of nucleus..


I couldn't think of anything else and I was losing time :frown:
I do remember a similar question and the mark scheme said to use the de broglie's wavelength equation, I'll try to look for it (or maybe that was unit 5, I'm so confused) how many marks was this question?
(edited 3 years ago)
Guys what did you write for the relativity question?
Original post by ilovephysmath
I couldn't think of anything else and I was losing time :frown:
I do remember a similar question and the mark scheme said to use the de broglie's wavelength equation, I'll try to look for it (or maybe that was unit 5, I'm so confused) how many marks was this question?

i think 5 marks...but you will get marks for working ryt..
Original post by Ammar Zavahir
Guys what did you write for the relativity question?


I found the time it would take for the muons to reach the bottom and showed that it was more than the average lifetime of a muon. then I discussed time dilation
Original post by ilovephysmath
I found the time it would take for the muons to reach the bottom and showed that it was more than the average lifetime of a muon. then I discussed time dilation

yass me tooo sameee
Original post by ilovephysmath
I found the time it would take for the muons to reach the bottom and showed that it was more than the average lifetime of a muon. then I discussed time dilation

wha....?
Original post by Ammar Zavahir
i think 5 marks...but you will get marks for working ryt..


hopefully, yeah
Original post by Ammar Zavahir
yass me tooo sameee

u know the spec clearly outlines no need to explain about relativity equations but in the paper they asked..XD
Original post by ilovephysmath
I found the time it would take for the muons to reach the bottom and showed that it was more than the average lifetime of a muon. then I discussed time dilation

The is the last question I attempt to answer.
Original post by Ammar Zavahir
yass me tooo sameee


all that extra reading helped 😅 the book definitely didn't go into enough detail
who the **** wrote 85-90 marks i barely think i got 60...YwY
Original post by Ammar Zavahir
u know the spec clearly outlines no need to explain about relativity equations but in the paper they asked..XD

lmao same here
Original post by Ammar Zavahir
Guys what did you write for the relativity question?

I had no idea what to write....
Original post by Ammar Zavahir
u know the spec clearly outlines no need to explain about relativity equations but in the paper they asked..XD


exactly!!! and that Millikan oil drop experiment too. but in Edexcel's defence we did that in unit 1 so I guess that's fair? because we didn't have to consider upthrust so it was relatively (ha pun intended) simple

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