Chapter 21 Musical Sounds.

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© 2010 Pearson Education, Inc. Conceptual Physics 11 th Edition Chapter 21: MUSICAL SOUNDS.

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Presentation transcript:

Chapter 21 Musical Sounds

The source of all musical sound is something vibrating. resonating. under both tension and compression. represented by a series of harmonics. Answer: A

The source of all musical sound is something vibrating. resonating. under both tension and compression. represented by a series of harmonics. Answer: A

What divides noise from music is most often imaginary. objective. subjective. nonexistent. Answer: C

What divides noise from music is most often imaginary. objective. subjective. nonexistent. Answer: C Explanation: Although the two can be discerned electronically, most often subjectivity is dominant.

As humans age, the range of sounds heard expands. decreases. Both of these. None of these. Answer: B

As humans age, the range of sounds heard expands. decreases. Both of these. None of these. Answer: B Comment: Looking for a career that will likely grow? Consider becoming an audiologist!

Low-pitched sounds have low frequencies. long periods. Both of these. None of these. Answer: C

Low-pitched sounds have low frequencies. long periods. Both of these. None of these. Answer: C Explanation: A low frequency has a long period. If you missed this, be careful in answering too quickly.

The notes of a piano keyboard differ in pitch. frequencies of sound they can produce. wavelengths of sound they can produce. All of these. Answer: D

The notes of a piano keyboard differ in pitch. frequencies of sound they can produce. wavelengths of sound they can produce. All of these. Answer: D

The frequency of a note one octave higher in pitch than a 440-hertz note is 1760 Hz. 880 Hz. 440 Hz. 220 Hz. Answer: B

The frequency of a note one octave higher in pitch than a 440-hertz note is 1760 Hz. 880 Hz. 440 Hz. 220 Hz. Answer: B

The fundamental frequency of a violin string is 440 hertz The fundamental frequency of a violin string is 440 hertz. The frequency of its second harmonic is 220 Hz. 440 Hz. 880 Hz. None of these. Answer: C

The fundamental frequency of a violin string is 440 hertz The fundamental frequency of a violin string is 440 hertz. The frequency of its second harmonic is 220 Hz. 440 Hz. 880 Hz. None of these. Answer: C

Joseph Fourier discovered that periodic waves can be represented by a series of nonperiodic waves. a binary code. the sum of a series of simple sine waves. heat propagation. Answer: C

Joseph Fourier discovered that periodic waves can be represented by a series of nonperiodic waves. a binary code. the sum of a series of simple sine waves. heat propagation. Answer: C

Our ears sort out the complex jumble of sounds that reach them Our ears sort out the complex jumble of sounds that reach them. In so doing, our ears perform a sort of Fourier analysis. digital recombination of signals. analog amplification. pitch analysis. Answer: A

Our ears sort out the complex jumble of sounds that reach them Our ears sort out the complex jumble of sounds that reach them. In so doing, our ears perform a sort of Fourier analysis. digital recombination of signals. analog amplification. pitch analysis. Answer: A

The loudness of a sound is most related to its frequency. wavelength. intensity. period. Answer: C

The loudness of a sound is most related to its frequency. wavelength. intensity. period. Answer: C

What is the threshold of human hearing? 1 decibel 10 decibels 100 decibels None of these. Answer: D

What is the threshold of human hearing? 1 decibel 10 decibels 100 decibels None of these. Answer: D Explanation: The threshold of hearing is 0 decibels (see Table 21.1).

Compared with a sound of 30 decibels, a sound of 60 decibels is twice as intense. 10 times as intense. 100 times as intense. 1000 times as intense. Answer: D

Compared with a sound of 30 decibels, a sound of 60 decibels is twice as intense. 10 times as intense. 100 times as intense. 1000 times as intense. Answer: D Explanation: Scaling sound intensity by factors of 10, we find that 30 dB is 103 times as intense as the threshold of hearing, and 60 dB is 106 times as intense as the threshold of hearing. Note that 106 (1,000,000) is 1000 times greater than (103) 1000. So sound at 60 dB is a thousand times as intense as sound at 30 dB.