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Physics: Post your doubts here!

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Thanks :)

but how do u know proton number decreases by 1 ? :/
idk wth is wrong wid me...i got it when i did it before but now m not :(
Yeah it happens always during exams that your brain just stops! :p :(
So basically it absorbs an electron right.
So an electron is negatively charged.
The nucleus has 28 protons = 28+ charge
If it absorbs one -1 charge then the charge will be 28 - 1 = 27+ charge :)
 
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View attachment 54660

This should help you realise it's dcos(Θ)

As for the square wave question, I'm not sure but is it D?

There are 5 antinodes given. That represents 2 wavelengths..

2*wavelength = 293 - 14 = 279mm.
wavelength = 279mm/2 = 139.5mm = 0.1395m

f = v/wavelength = 3.0x10^8m/s / 0.1395m = 2.2GHz
Thanks a lot ^.^

Btw,the ans to that ques is B ( I thought D too).. I'm attaching the screenshot of Examiner report .. see if it makes sense to you :) if it does then explain me too
 

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upload_2015-6-6_14-46-46-png.54658

How C?
 
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If I scored 'd' in my AS levels, and I did pretty well in paper 4 and 5 (75/100 and 27/30), then what is the maximum grade that I can score? Can I get an A?
Check the Grade thresholds of previous years. They have listed marks for every paper and grade.
You can calculate your marks in AS and then estimate the marks you need/got in Paper 4 and 5. Add them and you can get an idea of your grade.
 
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