# Exam 7 Numbers 16-20

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• 1.

### 16. A sound wave is an example of a(n) ______________ wave.

• A.

Transverse

• B.

Longitudinal

• C.

Crest-and-trough

• D.

Electromagnetic

B. Longitudinal
Explanation
A sound wave is an example of a longitudinal wave because it consists of compressions and rarefactions that travel in the same direction as the wave itself. In a longitudinal wave, the particles of the medium vibrate parallel to the direction of the wave propagation. This is in contrast to a transverse wave, where the particles vibrate perpendicular to the direction of the wave. A crest-and-trough wave refers to a type of transverse wave, and electromagnetic waves are a different type of wave altogether, characterized by the oscillation of electric and magnetic fields.

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• 2.

### 17. A sound wave consists of a series of

• A.

Compressions and rarefactions.

• B.

Longitudes and latitudes.

• C.

Hills and valleys.

• D.

Perpendicular vibrations

A. Compressions and rarefactions.
Explanation
A sound wave is a longitudinal wave, meaning it travels by compressing and rarefying the medium it passes through. In compressions, the particles are pushed closer together, resulting in a region of high pressure. In rarefactions, the particles are spread out, creating a region of low pressure. These alternating compressions and rarefactions form the series of disturbances that propagate as a sound wave.

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• 3.

### 18. The human perception of pitch depends on a sound’s

• A.

Velocity.

• B.

Wavelength.

• C.

Frequency.

• D.

Amplitude

C. Frequency.
Explanation
The human perception of pitch refers to our ability to perceive high or low frequencies of sound. Pitch is directly related to the frequency of a sound wave, which is the number of cycles or vibrations per second. Higher frequencies are perceived as higher pitches, while lower frequencies are perceived as lower pitches. Therefore, the correct answer is frequency.

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• 4.

### 19. When you hear the sound from a vehicle that is moving toward you, the pitch is higher than it would be if the vehicle were stationary. The pitch sounds higher because the

• A.

Sound waves arrive more frequently.

• B.

Sound from the approaching vehicle travels faster.

• C.

Wavelength of the sound waves becomes greater.

• D.

Amplitude of the sound waves increases.

A. Sound waves arrive more frequently.
Explanation
When a vehicle is moving towards you, the sound waves it produces are compressed, causing them to arrive at your ears more frequently. This results in a higher pitch because the frequency of the sound waves determines the perceived pitch.

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• 5.

### 20. The highness or lowness of a sound is perceived as

• A.

Compression.

• B.

Ultrasound.

• C.

Wavelength.

• D.

Pitch.

D. Pitch.
Explanation
The highness or lowness of a sound is perceived as pitch. Pitch refers to the frequency of a sound wave, with higher frequencies being perceived as higher pitches and lower frequencies being perceived as lower pitches. Compression, ultrasound, and wavelength are not directly related to the perception of the highness or lowness of a sound.

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