Physics for University Students; Mechanics, Sound and Light Volume 1

Physics for University Students; Mechanics, Sound and Light Volume 1

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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. 1896 edition. Excerpt: ...reflected wave-front. Draw AA" to the point of tan gen cy with the first circle. Then AA"B' is symmetrical with respect to A A'B'; and since ABB'A' is a parallelogram, the triangle AA'B' is equal to ABB'. Therefore, since the triangles AA"B' and ABB' are both equal to AA'B', they are equal to each other, and the angles BAB' and A"B'A are equal to each other. But the former is the angle of incidence, since the lines BA and B'A are perpendicular respectively to BB' and nB', and the angle BB'n is the angle of incidence. In the same way it can be shown that the angle A"B'A is equal to nB'r, the angle of reflection. The angle of incidence, therefore, equals the angle of reflection. The former is the angle between the incident wave-front and the reflecting surface CD; the latter is the angle between the wave-surface after reflection and the reflecting surface. The reflection of sound then follows the ordinary laws of the reflection of waves. 136. Relations of the Centres of the Direct and Reflected Systems of Waves Let 0 (Fig. 79) be the centre of the incident spherical waves, and let them be reflected from the surface AB. If these waves had met with no obstruction they would have taken positions at equal successive time-intervals indicated by the dotted lines; but they are reflected so as to have the positions of the full lines sym metrically situated on the other side of the reflecting surface. Let 01 be a sound-ray, or the direction of motion of any point of the incident wave; draw IM so that IM and 0/shall make equal angles with the normal. Then is IM the path of the reflected ray; that is, it is a normal to the reflected waves. Project IM backward till it intersects at 0' the normal to the reflecting surface through 0....
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Product details

  • Paperback | 80 pages
  • 189 x 246 x 4mm | 159g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236633253
  • 9781236633255