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Solutions to Test 1 spring 2008

# Solutions to Test 1 spring 2008 - Physics 2306 Spring 2008...

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Physics 2306 Spring 2008 First Exam FORM A 1) The pressure fluctuation from ambient pressure due to a sound wave is given by p(x,t) = (2.0 × 10 -5 N/m 2 ) sin[(5 π radians/meter) x + (4000 π radians/second) t] Which one of the following statements is true? A. The wave is a transverse wave and the pressure fluctuation and the displacement of air molecules are in phase. B. The wave is a transverse wave and the pressure fluctuation and the displacement of air molecules are 90 ° out of phase. C. The wave moves in the +x-direction with a speed equal to 800 m/s. D. The wave is a transverse wave and the pressure fluctuation and the displacement of air molecules are 180 ° out of phase. E. The wave has an antinode at x = 0.25 meters. F. The wave is a longitudinal wave and the pressure fluctuation and the displacement of air molecules are in phase. G. The wave is a longitudinal wave and the pressure fluctuation and the displacement of air molecules are 90 degrees out of phase. H. The wave has a node at time equal to 0.0010 seconds. 2-7) The displacement of air molecules from equilibrium due to a sound wave is given by s(x,t) = (0.020 microns)cos[(6.0 π rad/meter)x (2400 π rad/sec)t] 2) What is the amplitude (in microns) of the displacement? A. 6.0 π B. 0.33 C. 0.020 D. 50 E. 0.0025 F. 8.3E-04 G. 400 H. 2400 π 3) What is the period (in seconds) of the wave? A. 6.0 π B. 0.33 C. 0.020 D. 50 E. 0.0025 F. 8.3E-04 G. 400 H. 2400 π 4) What is the wavelength (in meters) of the wave?

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A. 6.0 π B. 0.33 C. 0.020 D. 50 E. 0.0025 F. 8.3E-04 G. 400 H. 2400 π 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.
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Solutions to Test 1 spring 2008 - Physics 2306 Spring 2008...

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