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Chapter 17: Q72P (page 510)
A bullet is fired with a speed of . Find the angle made by the shock cone with the line of motion of the bullet.
Angle made by shock cone is
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In Fig. 17-46, sound of wavelength is emitted isotropically by point source S. Sound ray 1 extends directly to detector D, at distance . Sound ray 2 extends to Dvia a reflection (effectively, a “bouncing”) of the sound at a flat surface. That reflection occurs on a perpendicular bisector to the SDline,at distance dfrom the line. Assume that the reflection shifts the sound wave by. For what least value of d(other than zero) do the direct sound and the reflected sound arrive at D(a) exactly out of phase and (b) exactly in phase?
The water level in a vertical glass tubelong can be adjusted to any position in the tube. A tuning fork vibrating atis held just over the open top end of the tube, to set up a standing wave of sound in the air-filled top portion of the tube. (That air-filled top portion acts as a tube with one closed and the other end open)(a) For how many different positions of the water level will sound from the fork set up resonance in the tube’s air-filled portion, which acts as a pipe with one end closed (by the water) and the other end open? What are the (b) least (c) second least water heights in the tube for resonance to occur?
You are standing at a distance D from an isotropic point source of sound. You walk toward the source and observe that the intensity of the sound has doubled. Calculate the distanceD.
(a) Find the speed of waves on a violin string of mass and lengthif the fundamental frequency is.
(b) What is the tension in the string? For the fundamental, what is the wavelength of (c) the waves on the string and (d) the wavelength of sound waves emitted by the string?
Straight lineconnects two point sources that are apart, emit sound waves of the same amplitude, and emit exactly out of phase. (a) What is the shortest distance between the midpoint of and a point onwhere the interfering waves cause maximum oscillation of the air molecules? What are the (b) second and (c) third shortest distances?
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