Exam 7 Target 7 Retake Preap

1. The highness or lowness of a sound is perceived as

A. compression.

B. ultrasound.

C. wavelength.

D. pitch.

The highness or lowness of a sound is perceived as pitch. Pitch is a subjective perception of the frequency of a sound wave. When a sound wave has a high frequency, it is perceived as a high-pitched sound, and when it has a low frequency, it is perceived as a low-pitched sound. Therefore, pitch is the correct answer to the question.

Explanation

The highness or lowness of a sound is perceived as pitch. Pitch is a subjective perception of the frequency of a sound wave. When a sound wave has a high frequency, it is perceived as a high-pitched sound, and when it has a low frequency, it is perceived as a low-pitched sound. Therefore, pitch is the correct answer to the question.

2. Pitch depends on the ______________ of a sound wave.

A. Frequency

B. Power

C. Amplitude

D. Speed

The pitch of a sound wave refers to how high or low the sound is perceived by the human ear. It is determined by the frequency of the sound wave. Frequency is the number of complete vibrations or cycles of a sound wave that occur in one second. Higher frequency waves have a higher pitch, while lower frequency waves have a lower pitch. Therefore, the correct answer is a. Frequency.

Explanation

The pitch of a sound wave refers to how high or low the sound is perceived by the human ear. It is determined by the frequency of the sound wave. Frequency is the number of complete vibrations or cycles of a sound wave that occur in one second. Higher frequency waves have a higher pitch, while lower frequency waves have a lower pitch. Therefore, the correct answer is a. Frequency.

3. Sound waves

A. are a part of the electromagnetic spectrum.

B. do not require a medium for transmission.

C. are longitudinal waves.

D. are transverse waves.

Sound waves are longitudinal waves because they propagate by compressing and rarefying the particles of the medium through which they travel. In other words, the particles of the medium vibrate parallel to the direction of the wave propagation. This is in contrast to transverse waves, where the particles vibrate perpendicular to the direction of the wave propagation. Sound waves require a medium for transmission, so option b is incorrect. Sound waves are not a part of the electromagnetic spectrum, so option a is also incorrect. Therefore, the correct answer is c.

Explanation

Sound waves are longitudinal waves because they propagate by compressing and rarefying the particles of the medium through which they travel. In other words, the particles of the medium vibrate parallel to the direction of the wave propagation. This is in contrast to transverse waves, where the particles vibrate perpendicular to the direction of the wave propagation. Sound waves require a medium for transmission, so option b is incorrect. Sound waves are not a part of the electromagnetic spectrum, so option a is also incorrect. Therefore, the correct answer is c.

4. Suppose you are on a moving bus as it passes a stationary car in which a stereo is playing music. Immediately after the bus goes past the car, you will hear the pitch of the music

A. become higher.

B. become lower.

C. remain constant.

D. become lower, then higher.

When the bus passes the stationary car, the sound waves from the car's stereo will reach your ears at a lower frequency. This is because the bus is moving towards the car, causing a compression of the sound waves. As a result, the pitch of the music will appear lower to you.

Explanation

When the bus passes the stationary car, the sound waves from the car's stereo will reach your ears at a lower frequency. This is because the bus is moving towards the car, causing a compression of the sound waves. As a result, the pitch of the music will appear lower to you.

5. Which of the following is the region of a sound wave in which the density and pressure are greater than normal?

A. rarefaction

B. amplitude

C. compression

D. wavelength

Compression refers to the region of a sound wave where the density and pressure are greater than normal. In this region, the particles of the medium are pushed closer together, resulting in an increase in density and pressure. This is in contrast to rarefaction, where the particles are spread out and the density and pressure are lower than normal. Amplitude refers to the maximum displacement of particles from their resting position, while wavelength refers to the distance between two consecutive compressions or rarefactions.

Explanation

Compression refers to the region of a sound wave where the density and pressure are greater than normal. In this region, the particles of the medium are pushed closer together, resulting in an increase in density and pressure. This is in contrast to rarefaction, where the particles are spread out and the density and pressure are lower than normal. Amplitude refers to the maximum displacement of particles from their resting position, while wavelength refers to the distance between two consecutive compressions or rarefactions.