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Physics: Post your doubts here!

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yesss question 5 cii
thank you :)

searched alot for this question ;)

so what i think is that we do like this:

I/A^2 = I*/A*^2

take the star ones as the resultants

so we need to give in the form of I.

its like I/(3)^2 = I*/(1)^2

why 3? cuz the intensity I is the intensity of the wave a ? so A must be of wave a too ;) :)

in the end it comes out to be I* = 1/9 I

hope this helps....
 
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searched alot for this question ;)

so what i think is that we do like this:

I/A^2 = I*/A*^2

take the star ones as the resultants

so we need to give in the form of I.

its like I/(3)^2 = I*/(1)^2

why 3? cuz the intensity I is the intensity of the wave a ? so A must be of wave a too ;) :)

in the end it comes out to be I* = 1/9 I

hope this helps....
thank you ! it did help
 
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or:
The principle of conservation of momentum is only true if the system is closed and no external force acts on the system, here the force due to gravity (gravitational force) acts on the ball, hence the law is not true here
 
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or:
The principle of conservation of momentum is only true if the system is closed and no external force acts on the system, here the force due to gravity (gravitational force) acts on the ball, hence the law is not true here

yeah i got it but can u explain the second occurence when the law doesnt apply cause i cant understand what it is trying to say?
 
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