hey guyz i have some doubts in physics paper 3
first thing , when excatly to we use sin i / sin r nd when do we use sin angle in air/ sin angle in medium ???
second , pp qs
http://www.xtremepapers.me/CIE/Cambridg ... 2_qp_3.pdf Q9 part a
also
http://www.xtremepapers.me/CIE/Cambridg ... 6_qp_3.pdf
q2 , part c , my teacher told me to choose any angle between the resultant line nd the other line nd say , forexample here , 44 degrees toward 8N
but in the marking scheme they said , vertically upward , hw dd they noe nd its not correct my teachers way ?
also q 7 , part d ??
nd http://www.xtremepapers.me/CIE/Cambridg ... 7_qp_3.pdf
q7 , part bi , ?? its angle of incidence ? supposedly angle of refraction is the 90 !
nd q10 , part b
nd also wen they say speed in less or more than calculated or k.E is more or less than calculated , wen do we say lost as heat nd wen do we say used to increase in K.E ?
nd finally can someone helpt me with the radioactivity experiments , the one to say count background radiations nd then subtract the countrate , etc ,,,,,
is there a criterion ???
thaaank you very much in advance
first thing , when excatly to we use sin i / sin r nd when do we use sin angle in air/ sin angle in medium ???
second , pp qs
http://www.xtremepapers.me/CIE/Cambridg ... 2_qp_3.pdf Q9 part a
also
http://www.xtremepapers.me/CIE/Cambridg ... 6_qp_3.pdf
q2 , part c , my teacher told me to choose any angle between the resultant line nd the other line nd say , forexample here , 44 degrees toward 8N
but in the marking scheme they said , vertically upward , hw dd they noe nd its not correct my teachers way ?
also q 7 , part d ??
nd http://www.xtremepapers.me/CIE/Cambridg ... 7_qp_3.pdf
q7 , part bi , ?? its angle of incidence ? supposedly angle of refraction is the 90 !
nd q10 , part b
nd also wen they say speed in less or more than calculated or k.E is more or less than calculated , wen do we say lost as heat nd wen do we say used to increase in K.E ?
nd finally can someone helpt me with the radioactivity experiments , the one to say count background radiations nd then subtract the countrate , etc ,,,,,
is there a criterion ???
thaaank you very much in advance