Question

a the car is moving toward the sound waves that are traveling in the same direction. the sound waves are pushed closer together. a person in front of the car hears a sound with a high pitch. b the car is moving away from the sound waves that are traveling in the opposite direction. the sound waves are farther apart. a person behind the car hears a sound with a low pitch. c the person in the car is moving at the same speed and direction as the sound waves. therefore, the person in the car always hears the same pitch of sound. how are loudness and amplitude related? the loudness of a sound is a measure of how well the sound can be heard. a sound’s loudness depends on the amplitude of the sound wave. the amplitude of a wave is a measure of how far particles move when the wave passes them. the larger the amplitude of a sound wave, the louder the sound. the smaller the amplitude of a sound wave, the softer the sound. the amplitude (and loudness) of a sound wave is determined by the wave’s energy. waves with a lot of energy take a look 5. explain why do the people at the rear of the car hear a sound of lower frequency than those at the front of the car?

Explanation:

This is due to the Doppler effect. When the car moves, for people at the front, the car is moving toward the sound waves (same direction as the waves traveling forward), so the waves get compressed (closer together), increasing frequency (high pitch). For people at the rear, the car is moving away from the sound waves traveling backward, so the waves are stretched (farther apart), decreasing frequency (lower pitch).

Answer:

The Doppler effect causes this. The car moving toward front - facing people compresses sound waves (higher frequency), while moving away from rear - facing people stretches sound waves (lower frequency).