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# Answer 2 - f = 1/T Therefore frequency is 100 Hz Wavelength...

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Answer the following questions without the use of a calculator. Questions marked ** are slightly more challenging. Answers and explanations are marked in bold red font. 1. What is the wavelength of a sound with a frequency of 20 Hz? a. 34 m b. 340 m c. 17 m (340/20) d. 1700 m 2. Two waves A and B have the same frequency (100 Hz), but have amplitudes of 10 and 20 volts, respectively (volts is an indirect unit of amplitude). What can be said about the two waves? a. They will have the same wavelength b. They will have different wavelengths c. They will have the same time period d. a and c 3. A certain sound has a time period of 0.01 s. What is the wavelength of this sound? ** a. 3.4 m (You need to first calculate the frequency of this sound by the formula
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Unformatted text preview: f = 1/T. Therefore frequency is 100 Hz. Wavelength = c/f = 340/100) b. 100 m c. 34000 m d. Cannot tell from this information 4. A certain sound has a wavelength of 17 cm. What is the frequency of this sound? ** a. 2 Hz b. 20 Hz c. 200 Hz d. 2000 Hz (Use c = 34000 cm/s as wavelength is expressed in cm. Therefore f = 34000/17) 5. A certain sound has a wavelength of 340 m. How many cycles would this sound complete in 5 s? ** a. 68 b. 1700 c. 5 (First, calculate the frequency of this sound. f = 340/340 = 1 Hz. So this sound will complete 1 cycle in 1 second, and so 5 cycles in 5 seconds.) d. 1...
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