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PHYS1C_W07_EX2

# PHYS1C_W07_EX2 - Name Date 1 The sound level of a dog's...

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Page 1 Name: __________________________ Date: _____________ 1. The sound level of a dog's bark is 50 dB. The intensity of a rock concert is 10,000 times that of the dog's bark. What is the sound level of the rock concert? A) 10,050 dB B) 500,000 dB C) 90 dB D) 2000 dB E) 54 dB 2. A train traveling at 90 km/h is blowing its whistle at 440 Hz as it crosses a level crossing. You are waiting at the crossing and hear the pitch of the whistle change as the train passes you. The sound you hear changes from a frequency of _____ to a frequency of _____. (Take the speed of sound to be 340 m/s.) A) 475 Hz; 410 Hz B) 410 Hz; 475 Hz C) 408 Hz; 472 Hz D) 472 Hz; 408 Hz E) 598 Hz; 348 Hz 3. Two identical loudspeakers face each other at a distance of 180 cm apart, along the horizontal x-axis and are driven by a common oscillator at 680 Hz. Assume x = 0 to coincide with the midpoint of the line joining the two speakers. Which of the following is/are possible point/s of maximum sound intensity?

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