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muskan
in Homework Help

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crest is 12 of a wavelength. find wavelength,time period, frequency and velocity.

I presume you mean "1/2 of a wavelength", not "12 of a wavelength". It is difficult to read your handwritten portion but it appears that you are told what the amplitude is. To find the wavelength, and then the frequency, you would need to be told the distance between crests but I do not see that on what you have.

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