FirstPhysicsSolutions

# FirstPhysicsSolutions - Physics 2306 Spring 2007 First Exam...

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Physics 2306 Spring 2007 First Exam 1) Which statement is true. A sound wave is A. a transverse wave. The displacement of air molecules and the pressure fluctuation are in phase. B. a transverse wave. The displacement of air molecules and the pressure fluctuation are 90 ° out of phase. C. a transverse wave. The displacement of air molecules and the pressure fluctuation are 180 ° out of phase. D. a longitudinal wave. The displacement of air molecules and the pressure fluctuation are in phase. E. a longitudinal wave. The displacement of air molecules and the pressure fluctuation are 90 ° out of phase. F. a longitudinal wave. The displacement of air molecules and the pressure fluctuation are 180 ° out of phase. 2-5) The displacement of air molecules from equilibrium in a sound wave is given by s(x,t) = (0.020 m)cos[(3.0 rad/meter)x (500 rad/sec)t] 2) What is the amplitude (in meters) of the wave? A. 3.0 B. 500 C. 2.1 D. 80 E. 0.013 F. 0.020 G. 9.4 H. 1,600 3) What is the period (in seconds) of the wave? A. 3.0 B. 500 C. 2.1 D. 80 E. 0.013 F. 0.020 G. 9.4 H. 1,600 4) What is the wavelength (in meters) of the wave? General expression for displacement of air molecules in a sound wave: s(x,t) = A cos[kx ± ω t] Compare to the equation for the displacement of air molecules given in this problem and identify the amplitude. General expression for displacement of air molecules in a sound wave: s(x,t) = A cos[kx ± ω t] Compare to the equation for the displacement of air molecules given in this problem and identify ω = 500. T = 1/f = 2 π / ω

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A. 3.0 B. 500 C. 2.1 D. 80 E. 0.013 F. 0.020 G. 9.4 H. 1,600 5) What is the velocity of propagation (in meters/second) of the wave (positive wave velocity is in the +x-direction and negative wave velocity is in the x-direction)? A. 170 B. 170 C. 27 D. 27 E. 1000 F. 1000 G. 520 H. 520 6) A pipe, which is 0.600 meters long, is open at both ends. What is the frequency (in Hertz) of the third harmonic from this pipe? Assume the speed of sound is 344 m/s. A. 573 B. 860 C. 1,150 D. 286 E. 143 F. 430 G. 387 H. 717 7 and 8) The displacement of a transverse wave is given by y(x,t) = (0.020 m)cos[(3.0 rad/meter)x (500 rad/sec)t] 7) What is the maximum transverse speed (in m/s ) of a point on the wave at the position x = 1.0 meters? A. 1,500 B. 170 C. 500 D. 0.060 E. 42 General expression for displacement of air molecules in a sound wave: s(x,t) = A cos[kx ± ω t] Compare to the equation for the displacement of air molecules given in this problem and identify k = 3.0. λ = 2 π /k General expression for displacement of air molecules in a sound wave: s(x,t) = A cos[kx ± ω t] where sign is a wave moving in the positive x-direction. The speed of the wave is given by:
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FirstPhysicsSolutions - Physics 2306 Spring 2007 First Exam...

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