Concept:The velocity of sound depends on the properties of the medium, such as wind and temperature, but not on the characteristics of the sound itself or on constant-pressure atmospheric changes.
Explanation:Pitch depends on frequency, and loudness depends on amplitude.
Neither frequency nor amplitude changes the speed of sound in a given medium.
At constant temperature, a change in atmospheric pressure does not affect sound velocity because the density of air changes in the same proportion.
Wind, however, directly moves the air medium.
When wind blows in the same direction as sound, it adds to the sound's speed relative to the ground.
When wind blows opposite to the sound, it reduces the observed velocity.
Thus, wind travelling in the same direction of the sound will affect its velocity.
Answer:C. Wind travelling in the same direction of the sound