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Unformatted text preview: karna (pk4534) – HW 16 – coker – (58245) 1 This print-out should have 23 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0 points A bat can detect small objects such as an insect whose size is approximately equal to one wavelength of the sound the bat makes. If bats emit a chirp at a frequency of 15 . 7 kHz, and the speed of sound in air is 326 m / s, what is the smallest insect a bat can detect? Answer in units of mm. 002 (part 1 of 2) 10.0 points The bulk modulus for water is 2 × 10 9 N / m 2 and the density of water is 1000 kg / m 3 . Find the speed of sound in water. Answer in units of km / s. 003 (part 2 of 2) 10.0 points The speed of sound in mercury is 1410 m / s and the density of mercury is 13600 kg / m 3 . What is the bulk modulus for mercury? Answer in units of N / m 2 . 004 10.0 points Consider a harmonic sound wave in air of density 1 . 2 kg / m 3 . The displacement wave has the form s ( x, t ) = s max cos( k x- ω t ) where k = 5 . 97 rad / m, ω = 2052 . 21 rad / s and s max = 3 . 98 × 10 − 6 m. Calculate the sound pressure Δ P ( x, t ) of this wave at x = 0 . 222 m and t = 0 . 00182 s. Answer in units of Pa. 005 10.0 points A loudspeaker produces a musical sound by means of the oscillation of a diaphragm. On what does the loudness of produced sound depend? 1. the frequency of oscillation and the am- plitude of oscillation 2. the kinetic energy of oscillation only 3. the frequency of oscillation only 4. the frequency of oscillation and the kinetic energy of oscillation 5. the amplitude of oscillation and the ki- netic energy of oscillation 6. the amplitude of oscillation only 7. the frequency of oscillation, the ampli- tude of oscillation, and the kinetic energy of...
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- Spring '08
- Physics, Wavelength, m/s