Physics, Experimental and Mathematical

Physics, Experimental and Mathematical

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1880 edition. Excerpt: ...(2d B.Sc). (4) What was the correction made by Laplace to the previous theoretical determination of the velocity of sound in air? What physical circumstance does it depend upon? Is the velocity affected by change of temperature? and if so, according to what law? State whether or not it is affected by the height of the barometrical column, and give a reason for your answer. If at 32 F. the velocity of sound in oxygen is 1040. feet per second, what will be its velocity in hydrogen, which is 16 times lighter than oxygen? Upon what physical quality of any given liquid does the velocity with which it transmits sound depend? (2d B.A.). (5) What is the influence of changes of pressure, temperature, or humidity on the velocity of sound in air? The velocity being 33,300 centimetres per second at 0 C. and 760 mm. pressure, what is it when the temperature is 25 C. and the pressure 745 mm.? (1st B.Sc). B. Doppler's Pr1nc1ple.--According as the ear and the source of sound approach towards or recede from each other, the pitch of the sound is raised or lowered. Let S = difference of distance between ear and sound at end of one second; a/=wave length of note emitted; v = velocity of sound in the medium. Normally, --waves would reach the ear per second; but when w the ear and source of sound are moving to or from each other, S...--waves more or less reach the ear according as the mot1on is w one of approach or retrogression. Hence the pitch of the note heard corresponds to---vibrations per second. Example.--A listener upon a locomotive approaches a trumpet giving a note of 256 vibrations per second, at the rate of 50 metres per second; what is the vibration frequency of note heard? (- = 332-3 metres). v+s 33g-3 + 5Q-W= 33?.13_ =294-656. Ans. 256 more

Product details

  • Paperback | 74 pages
  • 189 x 246 x 4mm | 150g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236505298
  • 9781236505293