Sound problem

You hear something slitering toward you in the dark. You know from past experience that somethings slither with a frewuency of 130 Hz. If you hear a frequency of 130+17 Hz, how fast is the litherer slithering toward you (in m/s)? The speed of sound is 300 m/s

Is is a doppler effect problem? But there is no wavelength given in here? Can anybody tell me how to do it?


Science Advisor
Homework Helper
Use the relation between wavelength, frequency and velocity to find the wavelength: [itex]v=\lambda f[/itex].
It's very easy to remember this formula, since f=1/T with T the period. The wave will travel 1 wavelength in 1 period, so v=wavelength/period.

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