# PHYS102Quiz5 - PRACTICE QUIZ 5 1 The frequency separating...

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P RACTICE Q UIZ 5 1. The frequency separating audible waves and ultrasonic waves is considered to be 20 kHz. What wavelength in air at room temperature is associated with this frequency? (Assume the speed of sound to be 340 m/s.) a. 1.7 cm b. 5.2 cm c. 34 cm d. 55 cm a 2. The speed of sound in air is a function of which one of the following? a. wavelength b. frequency c. temperature d. amplitude c 3. The density of a certain metal solid is 7.2 10 3 kg/m 3 , and its Young’s modulus is 10 10 10 N/m 2 . What is the speed of sound in this metal? a. 1.4 10 7 m/s b. 5 900 m/s c. 3 700 m/s d. 3 000 m/s c 4. How far away is a lightning strike if you hear the thunderclap 3.00 s after you see the lightning bolt strike? ( v sound = 340 m/s, v light = 3 10 8 m/s) a. 113 m b. 340 m c. 680 m d. 1 020 m d 5. A sound wave in air has a frequency of 500 Hz and a wavelength of 0.68 m. What is the air temperature? a.

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PHYS102Quiz5 - PRACTICE QUIZ 5 1 The frequency separating...

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