Study Guide for Midterm COMD 745

A sound wave requires which of the following to exist and travel, and how does it move in terms of compression, rarefaction, and air pressure?

• A medium, with movement involving compressions and rarefactions that create changes in air pressure.

• A vacuum, with movement involving only rarefactions and no change in air pressure.

• Only a solid, with movement involving compressions but not rarefactions.

• No medium, as sound can travel through empty space without changes in air pressure.

Sources for sound in the vocal tract include the main and secondary sources, each producing different types of sounds. Which of the following correctly matches the sources with the sounds they can produce?

• The main source produces voiced sounds, and the secondary source produces fricative and plosive sounds.

• The main source produces only nasal sounds, and the secondary source produces only vowel sounds.

• The main source produces fricative sounds, and the secondary source produces voiced sounds.

• The main source produces plosive sounds, and the secondary source produces only whispered sounds.

Frequency is defined as:

• The number of cycles per second, measured in Hertz (Hz)

• The amount of energy in a wave, measured in Joules

• The distance between two wave peaks, measured in meters

• The speed of a wave, measured in meters per second

The movement of sound waves is described by which two features?

• Frequency and amplitude

• Color and brightness

• Mass and volume

• Temperature and pressure

The relationship between intensity and distance is:

• Intensity decreases as distance increases.

• Intensity increases as distance increases.

• Intensity remains constant regardless of distance.

• Intensity and distance are not related.

Which of the following lists the four characteristics of sine waves?

• Amplitude, frequency, phase, and wavelength

• Amplitude, speed, direction, and color

• Frequency, voltage, current, and resistance

• Wavelength, period, mass, and energy

The frequency and period of a sine wave are related by which of the following equations?

• Frequency = 1 / Period

• Frequency = Period

• Frequency = Period^2

• Frequency = Period + 1

Wavelength is:

• the distance between two consecutive crests or troughs in a wave

• the height of a wave from its base to its crest

• the speed at which a wave travels

• the amount of energy carried by a wave

Which of the following correctly identifies low, medium, and high frequency waves?

• Low frequency: Radio waves, Medium frequency: Microwaves, High frequency: X-rays

• Low frequency: X-rays, Medium frequency: Radio waves, High frequency: Microwaves

• Low frequency: Microwaves, Medium frequency: X-rays, High frequency: Radio waves

• Low frequency: Gamma rays, Medium frequency: Ultraviolet, High frequency: Radio waves

Speech is an example of which type of wave?

• Transverse wave

• Longitudinal wave

• Electromagnetic wave

• Surface wave