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# Unit 2- Standing waves question watch

1. This is the question, i know it must be to do with standing waves and i should probably use v=f Lambda but i dont even know where to start or what its wanting, any help please?
Two loudspeakers face each other at a separation of about 30 m. They are connected to the same audio oscillator which is set at 170 Hz.
Describe and explain the variation of sound intensity heard by a student who walks at a slow speed of 0.50 ms-1 along the line joining the two speakers. [Use data]. (4marks)
Cheers.
2. So you know there's a standing wave; if you draw a little picture it might well help. You need to work out the period of the sound wave so that you know how many peaks and troughs to draw in. What will the student hear when ey reaches a trough? What about a peak?
3. I suppose you'd see how many wavelengths would fit into 30.
Giving the walking speed of the listener seems to imply they'd like you to calculate the rate at which he/she passes any notable positions.
4. So the period is 1/170 secs, would i then use the speed of sound divided by the frequency to give the wavelength?
i have no clue what he would hear i though the same but probably not.
cheers
5. Aah I understand, taa!

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