rev14sp10

# rev14sp10 - TA Tomoyuki Nakayama April 19th April 20th 2010...

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TA: Tomoyuki Nakayama April 19 th – April 20 th , 2010 PHY 2048: Physics 1 with Calculus, Spring 2010 Review: Chapter 17.1- 17.10 The purpose of this review is to refresh your memory. Physics is a cumulative subject, so make it sure that you understand basic concepts and typical problem solving techniques in previous chapters before moving on to a new chapter. ________________________________________________________________________________ A. Sound Waves & Interference Two identical sources of sound are separated by 1 m, and they emit waves in phase at wavelength of 0.3 m. If we move a sound detector along a large circle centered at the midpoint between the sources, at how many points does the detector detect constructive interference? B. Sound Levels Two sound waves differ in sound level by 1.00 dB. What is the ratio of the greater intensity to the smaller intensity? C. Doppler Effects Passengers in a car traveling at 15 m/s hear a siren with a frequency of 1000 Hz from a fire engine approaching them from behind at a speed of 40 m/s. What frequency do the passengers hear after the fire engine passes them?

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