Chapter 17

Distinguish between the terms in the following pairs. fundamental frequency-natural frequency

Distinguish between the terms in the following pairs. reverberation - resonance

Choose the word or phrase that best answers the question. A tone that is lower in pitch is lower in what characteristic? A) frequency B) wavelength C) loudness D) resonance

Choose the word or phrase that best answers the question. If the wave speed stays the same, which of the following decreases as the frequency increases? A) pitch B) wavelength C) loudness D) resonance

Choose the word or phrase that best answers the question. What part of the ear is damaged most easily by continued exposure to loud noise? A) eardrum B) stirrup C) oval window D) hair cells

Choose the word or phrase that best answers the question. What is an echo? A) diffracted sound B) resonating sound C) reflected sound D) an overtone

Choose the word or phrase that best answers the question. A trumpeter depresses keys to make the column of air resonating in the trumpet shorter. What happens to the note being played? A) Its pitch is higher. B) Its pitch is lower. C) It is quieter. D) It is louder.

Choose the word or phrase that best answers the question. When tuning a violin, a string is tightened. What happens to a note being played on the string? A) Its pitch is higher. B) Its pitch is lower. C) It is quieter. D) It is louder.

Choose the word or phrase that best answers the question. As air becomes warmer, how does the speed of sound in air change? A) It increases. B) It decreases. C) It doesn't change. D) It oscillates.

Choose the word or phrase that best answers the question. Sound waves are which type of wave? A) slow B) transverse C) compressional D) electromagnetic

Choose the word or phrase that best answers the question. What does the middle ear do? A) focuses sound B) interprets sound C) collects sound D) transmits and amplifies sound

Choose the word or phrase that best answers the question. An ambulance siren speeds away from you. What happens to the pitch of the siren? A) It becomes softer. B) It becomes louder. C) It decreases. D) It increases.

Explain Some xylophones have open pipes of different lengths hung under each bar. The longer a bar is, the longer the pipe beneath it. Explain how these pipes help amplify the sound of the xylophone.

Explain The triangle is a percussion instrument consisting of an open metal triangle hanging from a string. A chiming sound is heard when the triangle is struck by a metal rod. If the triangle is held in the hand, a quiet dull sound is heard when it is struck. Why does holding the triangle make the sound quieter?

Predict If the holes of a flute are all covered while playing, then all uncovered, what happens to the length of the vibrating air column? What happens to the pitch of the note?

Beats Two flutes are playing at the same time. One flute plays a note with a frequency of \(524 \mathrm{Hz} .\) If two beats per second are heard, what are the possible frequencies the other flute is playing?