Chapter 14: Problem 4
In what sense is "the wave" passing through the crowd at a football game really a wave?
Chapter 14: Problem 4
In what sense is "the wave" passing through the crowd at a football game really a wave?
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Get started for freeLight emerges from a 5.0 -mW laser in a beam 1.0 mm in diameter. The beam shines on a wall, producing a spot \(3.6 \mathrm{cm}\) in diameter. What is the beam's intensity (a) at the laser and (b) at the wall?
At a point \(15 \mathrm{m}\) from a source of spherical sound waves, you measure the intensity \(750 \mathrm{mW} / \mathrm{m}^{2}\). How far do you need to walk, directly away from the source, until the intensity is \(270 \mathrm{mW} / \mathrm{m}^{2} ?\)
A 2.0 -m-long string is clamped at both ends. (a) Find the longest wavelength standing wave possible on this string. (b) If the wave speed is \(56 \mathrm{m} / \mathrm{s}\), what's the lowest standing-wave frequency?
Water is about a thousand times more dense than air, yet the speed of sound in water is greater than in air. How is this possible?
A crude model of the human vocal tract treats it as a pipe closed at one end. Find the effective length of the vocal tract in a person whose fundamental tone is \(620 \mathrm{Hz}\). Sound speed in air at body temperature is \(354 \mathrm{m} / \mathrm{s}\)
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