Which statement does not explain the concept of the doppler effect? the answer is: as a sound source moves away from a stationary object, the sound waves are compressed, increasing the pitch. why? do i just have the question wrong i am so confused i thought that as a sound source moved away, the sound waves don't compress decreasing the pitch?

What property is a characteristic of a substance that can be observed and does not change the identity of the substance

Sawyer is studying diffraction. he draws a diagram of a plane wave to show how light waves travel. which best describes sawyer’s error? the wave fronts should be perpendicular to the direction in which the waves move. the arrow showing the direction of movement of the waves should be pointing to the left. the arrow showing the direction of movement of the waves should be pointing downward. the wave fronts should be both parallel and perpendicular to the direction in which the waves move.

Distinguish between linear momentum and angular momentum