The sound waves travel fastest:

A. in solids B. in liquids

C. in gases D. in vacuum

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

The speeds of sound in four different media are given below. Which of the following is the most likely speed in m/s with which the two under water whales in a sea talk to each other when separated by a large distance?

A. 340 B. 5170

C. 1280 D. 1530

When the pitch of note produced by a harmonium is lowered, then the wavelength of the note:

A. decreases

B. first decreases and then increases

C. increases

D. remains the same