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arlery said:It's A
zishi said:Because the half wavelength has an angle of 90 degree. Quarter of it is 45 degrees. The distance between those two points is less than a quarter of wavelength, so it must be less than 45 too.
yubakkk said:no one knows this ?? none of u are giving ans yar//////
any one try??
Mobeen said:http://www.xtremepapers.me/CIE/International%20A%20And%20AS%20Level/9702%20-%20Physics/9702_s06_qp_1.pdf
q 34
but it asked for "At what rate does the voltage source supply energy to the heater" .. wont we use the resistance of the supply ?Xthegreat said:Mobeen said:http://www.xtremepapers.me/CIE/International%20A%20And%20AS%20Level/9702%20-%20Physics/9702_s06_qp_1.pdf
q 34
E = I ( R + r )
12 = I (1 +3 )
I = 3A
rate of energy = power
P = I^2R
P = 3^2 x 3
P = 27W
Distance between one maximum and the other means half the wavelength, as the distance between a crest and a trough. So λ=30mm. Then by v=fλ, speed of waves = 3.0 x 10^8, ans is C.arlery said:How can I solve this?
arlery said:How can I solve this?
arlery said:^ Yeah it is, but how did you solve it?
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