Question

which of the following are true about the direction of sound waves in relation to the doppler effect? select all that apply a sound waves from a moving source travel outward in all directions. b sound waves get bunched up in front of the moving source. c sound waves spread out behind the moving source. d sound waves from a moving source travel only in the direction of the movement.

Explanation:

• Sound waves from a moving source travel outward in all directions. This is a fundamental property of sound wave propagation.
• When a source is moving, the sound waves in front of the source get bunched up (higher frequency observed) due to the motion of the source towards the observer.
• Behind the moving source, the sound waves spread out (lower frequency observed) as the source is moving away from that region.
• Sound waves do not travel only in the direction of the movement of the source. They have a spherical - like (in 3D) or circular - like (in 2D) wavefronts expanding from the source.

Answer:

A. Sound waves from a moving source travel outward in all directions.
B. Sound waves get bunched up in front of the moving source.
C. Sound waves spread out behind the moving source.