$A$ simple wave motion is represented by $y=5(\sin 4 \pi t+\sqrt{3} \cos 4 \pi t)$. Its amplitude is

Two sound waves having a phase difference of $60^{\circ}$ have a path difference of

The number of waves counted by an observer on the sea-coast in one minute is $54$. If the wavelength of the waves is $5 \text{ m}$, then the velocity of the waves in $\text{m/s}$ will be:

Write the equation of the relation between wave speed $(v)$,angular frequency $(\omega)$,and angular wave number $(k)$.

When a wave travelling in a medium is reflected from the boundary of a denser medium,which of the following will not change?

Select the correct statement about the reflection and refraction of a wave at the interface between medium $1$ and medium $2$.