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1st one, in the center of the screen we know there will be a bright fringe. Also, the bright fringe happens because of constructive interference. The principle of superposition states that the total amplitude will be the sum of the individual amplitudes in a constructive interference and since both the waves have the same amplitude (coherent sources), the total amplitude is 2a.Jaf ibadsiddiqi Capricedcapri 1357913579 geek101 and every1 pleeeeeaaaaseeee
can someone urgently help with this?
View attachment 13034
So I/(2a)^2 = I1/a^2
I1 = (I a^2)/4a^2 = I/4
2nd one:
E = Fl/AΔl = Fl/l^2 x Δl
Now take the constants to the other side of the equation.
l/l^2 x Δl = E/F
1/l x Δl = E/F
1/Δl = El/F = kl (k = constant)
So we know the relationship is inversely proportional.
Note, you don't use 2F. This is because the other F may be taken as a reaction force. This of when you're compressing a spring on a flat table. You're applying a force on top and the table is also applying an equal force from the bottom. Even though two forces are acting, we take the 'load' as only the force we're applying.
Good luck!