HANDBOOK OF ACOUSTICS - online book

A complete view of Acoustical Science & its bearings on music, for musicians & music students.

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EXAMINATION PAPERS.
283
Ans.—See pp. 165 and 165 and figures.
5.  (a) Explain clearly what is meant by interference of sound-waves. What is meant by " phase ? "
(b) Describe in detail how it is that the sound-waves that issue from a tuning-fork are alternately in opposite phase. Ans. (a) See pp. 136, 137, with figs. 67 and 68. (b) See pp. 141 and 142, with fig. 74.
6.    Compare by neat diagrams and explanations the intervals of a minor third and minor tenth in respect to their harmouiousness.
Ana —See pp. 188, 200, and 201.
CAMBRIDGE.
Examination for the Degree of Mus Bac., Part T, and special examination in Music for the Ordinary B.A. Degree.
Tuesday, May 23, 1899. 9 to 12.
Acoustics.
1. A tuning-fork is set into vibration. Describe fully the motion of a particle on one of the prongs, and the way in which sound from the fork reaches the ear of an observer.
Ans.—See p. 18, with fig. 14.
2 Upon what physical characteristics of the vibrations of a body do the loudness and pitch of the note emitted depend ? What experi­ments can you adduce in support of your statements ?
Ans.—Loudness depends upon amplitude, and pitch upon vibration number (see pp. 29, 30, et seq. for pitch and p. 32 for loudness).
3.  (a) Describe some form of resonator, and explain how resonators can be applied to the analysis of compound sounds.
(b) A note on a pianoforte is struck staccato—(1) when the octave above is held down ; (2) when the octave below is held down. Describe and explain what is heard in each case.
Ans.—{a) See pp. 65, 66, and 67 with figs. 37 and 38. See also p. 7C.
(b) The strings of the octave above sound by resonance with the two vibrating halves of the string struck; (b 2) the two halves of the strings an octave below sound by resonance with the original strings struck (see also p. 70).
4.   (a) Describe the motion of the air in an open organ-pipe sounding its fundamental note.