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Formula to be used, is : d sin theta = n times lambda...
That helps a lot, thanks
Tension = Force
Constant velocity means that the upward and downward forces on the slope are equal. The two downward forces are weight, mg sin theeta, which always acts down the slope, and friction, which would now act in the opposite direction to the motion of the log. Thus the two forces down the slope would equal the tension which are mg sin theeta + 650
Well S1 and S2 are not closed together in the question. I think you meant S2 closed only. When S2 was closed, it gave us the correct reading of 30 ohm, as both the lamps are in series. However, when S2 and S3 are closed, it should have given us 22.5 as you stated. However, it gave us 15 ohm only. That is why the problem is in lamp 3. I think you just confused the switches with one another while explaining it to himHey calm down brother.Its an easy concept and yes i sometimes too find the electricity part a bit irritating.But heres the logic in this one.You just didnt read the question properly.It says "three similar lamps A, B and C".So all of them should have 15ohm.But u can see that when S1 and S2 are closed the resistance is 30 ohm which is wrong it should have been 22.5 ohm as B and C are in parallel.But its coming greater.So fault is in lamp C becuz other lamps are showing 15ohms resistance as u already figured out.
Your welcome and Best of luck.
I don't get how suddenly sin theta/n lambda! :S
For calculating the maximum number of orders, use d sin 90 = n lamda.... We use 90 (from what i can understand) because that is the maximum possible angle at which the light can diffract. However, it would give you a value in decimals, and you will round it off to the previous value.
But that is the question i explained to you
Sorry, but the question you explain was from variant 22 of the same yearBut that is the question i explained to you
Oops sorry. I just saw the diagram and thought it was the same question.
Yes oh im sorry.I wrote the wrong lamp number.My apologies!
max time =
the phase difference will be 90 degree . so the crest of the drawn wave will be on40 instead of 20 . and so the whole wave will shift .
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