Physics Test Chapter 1 - Planet Holloway
Planet Holloway Physics websheet 13.1
Cp Physics - Sound
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1. What is the intensity of sound waves produced by a tuba at a distance of 2.2 m when the power output of the tuba is 0.7 W?
2. If the intensity of a sound is 6 x 10-4 W/m2 at a distance of 8 m, what is the power of the sound?
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3. A wave on a guitar string has a velocity of 676 m/s. The guitar string is 62.5 cm long. What is the fundamental frequency of the vibrating string?
4. What length of guitar string has a velocity of 700 m/s and a fundamental frequency of 842 Hz?
5. A resonating glass tube closed at one end is 5 cm wide and 42 cm long. What are the first two harmonic frequencies of the resonating tube? The speed of sound in air is 343 m/s.
6. What is the length of an open pipe in which the fifth harmonic frequency is 3680? The speed of sound in air is 343 m/s.
7. As two notes are sounded 5 beats per second are heard. The frequency of one note is 641 Hz. What is the frequency of the other note?
Answers:
1. 0.012 W/m2
2. 0.48 W
3. 540.8 Hz
4. 41.5 cm
5. 204.2 and 612.5 Hz
6. 0.23 m
7. 646 Hz or 636 Hz
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