Qualification > Sciences
How to prepare for physics paper 1(cie)??????
Joseph_COOL:
Q22 Nov 09 plz
Joseph_COOL:
anyone plz Q22 and Q26 November O9
halosh92:
--- Quote from: Joseph_COOL on May 18, 2010, 03:37:52 pm ---anyone plz Q22 and Q26 November O9
--- End quote ---
Q26) n lamda= d sin thita
its fallin at 90 degrees (normal) as they say so thita =90
sin 90= 1 ( check with ure calculator)
we have to find "n"
n * (450*10^-9) = 1/(300* 10^3)
(300 mm as i mentioned previously it would be 1/300 but because its mm so u have to change m to mm so 300 *10^3...so it would be 1/(300*10^3)
we dont consider sin 90 in the equation because its =1
anyways
when u solve the equation n=7.4
so basically u have 7 maximas..BUT..they asked for the total number of maximas
u have 7 maxima up and 7 maxima down thats 14...and dont forget the central main maxima where u find the white light on the centre of the screen thats a maxima
so 14 + 1= 15 maxima in toal
got it?
Joseph_COOL:
thanks very much halosh u got an easy way of explanation :D :D
halosh92:
--- Quote from: Joseph_COOL on May 18, 2010, 03:50:19 pm ---thanks very much halosh u got an easy way of explanation :D :D
--- End quote ---
glad to help dude ;D ;D ;D
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