A)The range of frequencies audible to humans is from about 20 Hz to 20kHz. Assuming that the speed of sound in air is 343 m/s, the wavelength of a 20 kHz sound is: a) 58 cm b) 1.8 cm c) 6860 km d) 400 km
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A)The range of frequencies audible to humans is from about 20 Hz to 20kHz. Assuming that the speed of sound in air is 343 m/s, the wavelength of a 20 kHz sound is:
a) 58 cm b) 1.8 cm c) 6860 km d) 400 km
B) A 640 Hz tuning fork is placed on the open edge of a resonance tube of initial length L = 0 cm. Assume that the speed of sound is 330 m/s. As the tube becomes longer, successive whistles of maximum intensity (for example, from L1 to L3, or from L3 to L5, etc.) are heard at intervals L. What is the value L. Note: Be careful with the units
a) 51.7 cm b) 194 cm c) 19.4 km d) 25.8 km e) 12.9 cm
C) In a tube that has one end closed (the other open), with a fundamental frequency of 256 Hz, which of the following frequencies cannot produce resonance?
a) 5.12 kHz b)There is no restriction to any frequency c) 19.7 kHz d) 768 Hz e) 1.28 kHz
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