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Yes we would use the relation for intensity and amplitude(intensity is directly proportional to amplitude squared). You need not explain how to calculate k(intensity in terms of k should be fine).And plz tell me how will the intensity be calculated from the amplitude. Amplitude² is proportional to intensity but how will the value be calculated as we don't know of any constant in this equation.
P.s should't the microphone be placed beside the speaker with a barrier in between? And to measure the amplitude of incident wave a cro should also be connected to speaker. Is it so?
This one may sound silly but that's okay Don't we need to give any electricity supply to the microphone?
Yes the microphone will be placed besides the speaker but in a side-view diagram, that is impossible to show hence I have shown them infront of each other.
You are measuring the amplitude of the wave that get reflected from the wall and foam, so you would connect CRO to microphone, not the speaker.
Yes we need to give a supply to the microphone but that's not really important to the question here - it would be a waste of space on the diagram and would make the diagram messy. You could mention it in the space below.