# Quiz1A - Physics 1C Spring 2010 Quiz 1A Name Constants...

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Physics 1C Spring 2010 Quiz 1A Name___________________________________ Constants. speed of sound in air = 340 m/s, acceleration of gravity g = 9.8 m/s 2 MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) Two speakers vibrating at the same frequency are placed directely in front of an observer. As one speaker is moved backward by 10 cm the measured sound intensity goes from a maximum to a minimum. The frequency of the sound is _________. A) 1.7 kHz B) 3.4 kHz C) 5.5 kHz D) 0.85 kHz 1) 2) A column of air 10 cm long has one end open and one end closed. The wavelength of the third harmonic in this tube is _________m. A) 30 cm B) 13 cm C) 3.3 cm D) 6.7 cm 2) 3) The sound of an warning siren with an audio power of 100 W is heard by a person at an intensity level of 60 dB. Assuming that sound propagates uniformly in all directions without dissipation how far from the siren is the person? A) 2.8 km B) 5.3 km C) 1.6 km D) 0.75 km 3) 4) When white light is refracted by passing through the interface from air to glass, the angle of refraction is greatest for __________ light.

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Quiz1A - Physics 1C Spring 2010 Quiz 1A Name Constants...

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