Which of the following is not a transverse wave?

Mention the type of ultrasonic waves and their frequency.

The speed of sound in air at temperature $T$ and pressure $p$ is $v$. When the temperature is increased to $2 T$ and the pressure is reduced to $\frac{p}{2}$, then the speed is changed to

What is called compression or condensation? Which type of changes in density and pressure take place in it?

$A$ train,standing in a station yard,blows a whistle of frequency $400 \, Hz$ in still air. The wind starts blowing in the direction from the yard to the station with a speed of $10 \, m/s$. Given that the speed of sound in still air is $340 \, m/s$. Mark the $INCORRECT$ statement:

Newton assumed that sound propagation in a gas takes place under which condition?