The highest note written for a singer in a publishedscore was F-sharp above high C, 1.480 kHz, for Zerbinettain the original version of Richard Strausss operaAriadne auf Naxos. (a) Find the wavelength of this soundin air. (b) Suppose people in the fourth row of seatshear this note with level 81.0 dB. Find the displacementamplitude of the sound. (c) What If? In response to complaints, Strauss later transposed the note downto F above high C, 1.397 kHz. By what increment didthe wavelength change?
Reflection at a plane surface • Light rays from a point radiate in all directions. • Light rays from an object point reflect from a plane mirror as though they came from the image point. Refraction at a plane surface • Light rays from an object at P refract as though they came from the image point P Image formation by a plane mirror Copyright © 2012 Pearson Education Inc. Characteristics of the image from a plane mirror • The image is just as far behind the mirror as the object is in front of the mirror. • The lateral magnification is m = y/y. • The image is virtual, erect, reversed, and the same size as the object. The image is reversed • The image formed by a plane mirror is reversed