## University Physics with Modern Physics (14th Edition)

(a) $\lambda = 0.439~m$ $T = 1.28~ms$ (b) $\lambda = 0.219~m$
(a) We can find the wavelength. $\lambda~f = v$ $\lambda = \frac{v}{f}$ $\lambda = \frac{344~m/s}{784~Hz}$ $\lambda = 0.439~m$ We can find the period of oscillation. $T = \frac{1}{f}$ $T = \frac{1}{784~Hz}$ $T = 0.00128~s = 1.28~ms$ (b) If the sound wave is one octave higher, the frequency is 1568 Hz. We can find the wavelength. $\lambda~f = v$ $\lambda = \frac{v}{f}$ $\lambda = \frac{344~m/s}{1568~Hz}$ $\lambda = 0.219~m$