Sound travels in air :

A. if particles of medium travel from one place to another

B. if there is no moisture in the atmosphere

C. if disturbance moves

D. if both, particles as well as disturbance move from one place to another

A musical instrument is producing a continuous note. This note cannot be heard by a person having a normal hearing range. This note must then be passing through:

A. water B. wax

C. vacuum D. empty vessel

Which one of the following does not consist of transverse waves?

A. light emitted by a CFL

B. TV signals from a satellite

C. ripples on the surface of a pond

D. nusical notes of an orchestra

In the sound wave produced by a vibrating turning fork shown in the diagram, half the wavelength is represented by: (picture)

A. AB B. BD

C. DE D. AE

The maximum speed of vibrations which produce audible sound will be in :

A. dry air B. sea water

C. ground glass D. human blood