State any two characteristics of a wave motion.

The loudness of a sound depends upon

Establish the relationship between the speed of sound, its wavelength, and frequency. If the velocity of sound in air is $340 \, m \, s^{-1}$, calculate:
$(i)$ The wavelength when the frequency is $256 \, Hz$.
$(ii)$ The frequency when the wavelength is $0.85 \, m$.

If the frequency of a tuning fork is $400 \, Hz$ and the speed of sound in air is $340 \, m/s$. Find how far sound travels when the tuning fork makes $16$ vibrations. (in $m$)

$A$ laboratory uses an ultrasonic scanner to trace a tumour in tissue. The operating frequency of the scanner is $4.2 \times 10^{6} \text{ Hz}$. Calculate the wavelength of sound in the tissue if the speed of the sound is $1700 \text{ m s}^{-1}$.

Explain how the human ear works in the transmission of sound waves to the brain.