Question

Which of the following statements is not true about a sound wave ?

• A. Sound travels faster in steel than in air
• B. Sound is a longitudinal wave
• C. The speed of sound in gas is not affected by a change in pressure of the gas
• D. The speed of sound in a gas decreases with increases in the temperature of the gas

Answer 1

The correct option is D The speed of sound in a gas decreases with increases in the temperature of the gas

A- Sound travel faster in solid than in gas. Here still is solid and air is gas.

B- Sound is a longitudinal wave as it can travels from one point to another point by to and fro.

C- Speed of sound in gas in independent of pressure and hence the answer.

D- The speed of the sound in a gas increases with the increasing in temperature of the gas.

Hence D is incorrect ..