Quiz6 A - Exam Name_Sound waves_ MULTIPLE CHOICE. Choose...

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Exam Name__Sound waves_________________________________ MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) Suppose the pressure of a gas is increased by a factor of 2 with the volume held constant. For a wave of the same intensity and frequency, by what factor has the displacement changed? A) 1.14 B) 0.877 C) 2.00 D) 0.71 2) A thermal gradient exists in an ideal gas (one where the ratio of pressure to density is proportional to temperature, P/ρ = αT). At a temperature of 273 K the sound velocity is 1030 m/s. What is the velocity at 323 K? A) 1219 m/s B) 1121 m/s C) 67.8 m/s D) The constant γ is needed. 3) A small source of sound about 10.0 cm in diameter has an output power of 200.0 W. If the sound is projected equally in all directions, what is the intensity in dB at a distance of 100.0 m from the source? A) - 28 B) 113 C) 143 D) 92 4) A sound wave in air has an intensity of 0.600 W/m 2 . For a wave with the same frequency and displacement,
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This note was uploaded on 11/18/2011 for the course PHYS 2C PHYS 2C taught by Professor Groisman during the Spring '11 term at UCSD.

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Quiz6 A - Exam Name_Sound waves_ MULTIPLE CHOICE. Choose...

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