Question

The velocity of sound at 20°C is approximately
(a) 3400 m/sec.
(b) 340 m/sec.
(c) 430 m/sec
(d) 304 m/sec.

Answer 1

Answer:

the correct answer is option d that is 304m/sec.

Answer 2

The velocity of sound at 20° C is approximately 340 m/s. (Option B)

• At room temperature, the velocity of sound in air is 333 m/s.
• At 20°C, the volume of air would rise, causing the density to drop.
• As the temperature rises, the density lowers, causing the velocity to rise.
• As a result, at higher temperatures, the velocity of sound in the air increases and exceeds the velocity of sound in the air at normal temperatures, which is 333m/s.
• As a result, the velocity will be slightly larger than 333m/s, or 340 m/s. (Choice B)