Qualification > Sciences
CIE physics paper 2
happy angel:
--- Quote from: saadiyah on November 15, 2009, 06:09:32 pm ---plzz help me with this one..
It is possible to use two separate oscillators feeding 2 loudspeakers to demonstrate interference of sound. It is not possible to use 2 filament lamps, however similar, to produce interference of light. explain this difference.
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am not sure but abt the filaments la i fink its bcoz for interference to occur the sources must b monochromatic ie sme freq n wavelength wiv phase diff etc as i xplained above..
for the sound maybe the oscillators may be made to vibrate at the same freq so that interence occurs and the loudspeakers act as slits with d being the distance btwn the slits.. it will give the intensity of sound after interference ie soft or loud..wich rep the dark n bright fringes respectively..
i hope u und ;D :-[ ::) ??? 8)
happy angel:
--- Quote from: falafail on November 15, 2009, 06:13:05 pm ---oh sorry, i meant 4 (b) (i) 1 not 4 (a) D:
and um, all of it. i need someone to explain what affects separation/brightness of fringes etc
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ah sory,, it must be comparable to wavelength.. so smfing relatively small eg 1mm
abt separation of fringes use the eqn B=(D times lamda)/d
were D is distance btwn double slit arrangement and screen
d is separation of the 2 slits..
varying D and d ul see abt separation.
now intensity.
use I = k/r2
were r is the distance btwn 1st slit and the double slit..
wen r decreases I ie intensity increases.
ermm i managed to mk u und? a bit? ???
saadiyah:
--- Quote from: happy angel on November 15, 2009, 06:21:40 pm ---am not sure but abt the filaments la i fink its bcoz for interference to occur the sources must b monochromatic ie sme freq n wavelength wiv phase diff etc as i xplained above..
for the sound maybe the oscillators may be made to vibrate at the same freq so that interence occurs and the loudspeakers act as slits with d being the distance btwn the slits.. it will give the intensity of sound after interference ie soft or loud..wich rep the dark n bright fringes respectively..
i hope u und ;D :-[ ::) ??? 8)
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thx happy angel..i think i get it :D
happy angel:
--- Quote from: saadiyah on November 15, 2009, 06:45:23 pm ---thx happy angel..i think i get it :D
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welcome dr... n thx u too 4 mking me revise.. hehe ;D
happy angel:
--- Quote from: happy angel on November 15, 2009, 06:49:43 pm ---welcome dr... n thx u too 4 mking me revise.. hehe ;D
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hey tell me in june 09 p2 the 1st ans wen u calculate error its 0.18.
in marking scheme its 0.09
y shud we divide by 2??
plzz tl meee :'( :-[
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