# HANDBOOK OF ACOUSTICS - online book

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

 EXAMINATION PAPERS. 287 (b) Given that is tuned to have a frequency of 263, -(&- and oti jCC so found, calculate those of Ana.—(a) See p. 51. a 2367 D = 263 X g = -g" = 295Ł 3 789 G = 263 X o = -5- = 394i A = 263 X ? = -a1 = 438i W A = 394Ł X J = 7101 7101 -j-r = 443-U 16                 i& 2X8 789 X 3 D' z= 394Ł X g = ----f— = T = 591| 4.   (a) Explain the production of beats, (b) Suppose a set of forks to be tuned to philosophic pitch in which C = 256; and that a fork mistuned to 260 vibrations per second is procured. How many beats per second will the mistuned fork make (1) when sounded only with C = 256; (2) when sounded with 4C s= 264; and (3) wheD sounded with CI = 512 ? Am.—(a) See pp. 144, 145, 146. (J) (1) 260 — 256 = 4 beats per second. (2)    264-260= 4 „ (3)    512 — 260 = 252 Differential. 260 — 252 = 8 beats per second. 5.  (a) Enunciate the laws which govern the frequency of vibration of a stretched string ; (b) and point out how these laws come in, in the construction, tuning, and playing a violin. Am.—(a) See p. 87. (b) See pp. 88, 89, and 90.