Write true of false for the following statements:

The wavelength of 5 MHz ultrasound in a medium where the velocity is 1540 m s^-1 is 0.3 mm.

Write true of false for the following statements:

Sound and light travel in a medium in the form of crests and troughs and rarefactions and compressions respectively.

Write true of false for the following statements:

Light waves require no medium for their propagation.

Write true of false for the following statements:

Sound produced by a sounding body of frequency 300 Hz covers 34 m in the time the sounding body produces 30 vibrations.

Write true of false for the following statements:

Velocity of sound in air is more for higher frequency than for lower frequency.