At first you have to convert your wavelength to meters: 75 cm = 0.75m then you need to know the speed of sound - I've found that it is 340.29 m/s and finally, you can use this equation: λν = c (0.75m) (f) = 340.29 f = 340.29 / 0.75 f=453.72 Hz
The frequency of a sound wave with a wavelength of 75 cm is approximately 453.33 Hz. This is calculated using the formula that relates wavelength, frequency, and the speed of sound. By converting the wavelength to meters and substituting the values, we find the frequency.
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