Given that sound travels in air at $340 \, m s^{-1}$,find the wavelength of the waves in air produced by a $20 \, Hz$ sound source. If the same source is put in a water tank,what would be the wavelength of the sound waves in water? (Given,speed of the sound in water $= 1480 \, m s^{-1}$)

(N/A) Given: Speed of sound in air $V_{a} = 340 \, m s^{-1}$,frequency $v = 20 \, Hz$.
Using the formula $V = v \lambda$,the wavelength in air is $\lambda_{a} = \frac{V_{a}}{v} = \frac{340}{20} = 17 \, m$.
Given: Speed of sound in water $V_{w} = 1480 \, m s^{-1}$.
The frequency $v$ remains constant when the source is moved to a different medium.
Therefore,the wavelength in water is $\lambda_{w} = \frac{V_{w}}{v} = \frac{1480}{20} = 74 \, m$.