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.                        285
Tuesday, May 22, 1900. 9 to 12.
1.  (a) Explain the mode in which sound is transmitted through the air. (b) How do the motions of the particles of air within a sounding
organ-pipe differ from the motions of the particles of air outside the pipe by which the sound is transmitted to a distance ?
Am.—(a) See pp. 16, 17, and 18.
(*) See pp. 102 and 104 with fig. 54 (A).
2.    In what respect does a musical sound differ from a noise ? What is the evidence in support of your statements ?
Ans.—See p. 2.
3.  (a) What is meant by resonance? (b) Explain why a resonator responds most strongly to a note of a certain definite pitch.
Ans.—(a) See p. 57. {b) See pp. 60 and 61.
4.  (a) What are the relations between the upper partial tones of a sounding string and the fundamental tone ?
(b) Draw diagrams illustrating the motion of a string which is sounding its fundamental and second upper partial simultaneously.
Ans.—{a) See p. 93.
{b) Let a b e d ef g and a h k I m n g represent two positions of the string at some given instant, the former as if the fundamental alone were being produced and the latter the second upper partial alone.
Then the thicker curve will represent the resultant motion, that is to say one position of the string when the two are produced simultane­ously. For details as to construction see p. 82.
5.    Describe the mechanism by which the human voice produces musical sounds, and explain how the pitch and quality of these sounds are controlled.
Ans.—See pp. 114 and 115.
6.    (a) Describe and explain what is heard when two notes very nearly in unison are sounding together.
(}) If two organ-pipes in exact unison be sounded at opposite ends of a large room, what will be heard by a man who walks from one of the pipes to the other.
Ans.—(a) See pp. 144, 145, and 146.