State whether the following statement is true or false:
The wavelength of $5\, MHz$ ultrasound in a medium where the velocity is $1540\, m s^{-1}$ is $0.3\, mm$.

(B) The statement is False.
Given: Frequency $(f)$ = $5\, MHz = 5 \times 10^6\, Hz$,Velocity $(v)$ = $1540\, m s^{-1}$.
The formula for wavelength $(\lambda)$ is $\lambda = \frac{v}{f}$.
Substituting the values: $\lambda = \frac{1540}{5 \times 10^6} = 308 \times 10^{-6}\, m = 0.308 \times 10^{-3}\, m = 0.308\, mm$.
Since $0.308\, mm \neq 0.3\, mm$,the statement is False.