A sound wave has a wavelength of 0.20m. What is phase difference between two points along the wave which are 0.65 m apart.
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0.45 is the correct answer.
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Given: A sound wave has wavelength of 0.20 m. Two points along the wave are 0.65 m apart.
To find: Phase difference between these two points
Explanation: Let wavelength be denoted as l. Then, l= 0.2 m. Let distance between these two points be x. Then, x= 0.65 m
The phase difference between two sound waves of the same frequency moving past a fixed location is given by the time difference between the same positions within the wave cycles of the two sounds.
Phase difference= 2πx/l
= 2 * π *0.65/ 0.2
= 6.5 π
Therefore, the phase difference between two points at 0.65m apart is 6.5π.
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