Qualification > Sciences
Physics Help HERE ONLY !!
astarmathsandphysics:
I dont think it really matters It could be that the paper is tilted
Hope:
Hey..may anyone please clarify why in November 2008 Qn c), the value of the ice melted is = 14.2??
The question makes it seem like 2.1 g of ice melted..
Also, qn 6b), they've inverted the equation to find the refractive index.. the 30 degrees angle is like the incident angle, however they've assumed it's the refractive angle. I'm not sure why, but is it because, if the angle we're trying to calculate, were to emerge into the glass, that's the angle it would form?
Help please :(
astarmathsandphysics:
everywebsite in asia is slow from where I am. Is anyone else noticing this esp with sites hosted in malaysia eg bitspyder.net
Hope:
anyone?
Ghost Of Highbury:
--- Quote from: Hope on June 03, 2009, 02:45:24 pm ---Hey..may anyone please clarify why in November 2008 Qn c), the value of the ice melted is = 14.2??
The question makes it seem like 2.1 g of ice melted..
Also, qn 6b), they've inverted the equation to find the refractive index.. the 30 degrees angle is like the incident angle, however they've assumed it's the refractive angle. I'm not sure why, but is it because, if the angle we're trying to calculate, were to emerge into the glass, that's the angle it would form?
Help please :(
--- End quote ---
u do it like this
n = sin i / sin r
1.49 = sin 30 / sin r
sin r = sin 30/ 1.49
sin r = 0.3355
r = sin(-1) 0.3355
r = 19.6 degree
i think the markscheme is wrong
they have applied the incorrect formula
it is n = sin i / sin r
but they have used n = sin r / sin i
------------------------------------
for nov 08 Q c.>(the ice one)
shogun has explained it clearly
here https://studentforums.biz/index.php/topic,1798.360.html
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