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Unformatted text preview: Exam Phys 2C, Spring 10 Name__Mechanical waves_________________________________ MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) The molecular mass of helium is 4.00 x 103 kg/mol and the adiabatic constant is 1.67. The speed of sound in helium gas, taken as an ideal gas, at a temperature of 350 K and a pressure of 80 kPa, in SI units, is closest to: A) 1000 B) 1100 C) 800 D) 900 E) 1200 2) The howler monkey is the loudest land animal and can be heard up to a distance of 1.4 km. Assume the acoustic output of a howler to be uniform in all directions. The distance at which the intensity level of a howler's call is 49 dB, in SI units, is closest to: A) 6.0 B) 8.4 C) 7.5 D) 5.0 E) 9.9 3) I stretch a rubber band and "plunk" it to make it vibrate in its second harmonic. I then stretch it to twice its length and now make it vibrate in the fundamental frequency (first harmonic). The rubber band is made so that doubling its length increases the tension by a factor of 8 and reduces the mass per unit length by a factor...
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 Spring '11
 groisman

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