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Chapter 11: Q3Q (page 292)
Why is it incorrect to think that the more digits you include in your answer, the more accurate it is?
Adding more digits to an answer does not increase its accuracy.
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What frequency of sound would have a wavelength the same size as a\(0.75\;{\rm{m}}\)wide window? (The speed of sound is 344 m/s at\(20^\circ {\rm{C}}\).) What frequencies would diffract through the window?
A particular string resonates in four loops at a frequency of 240 Hz. Give at least three other frequencies at which it will resonate. What is each called?
What is the ratio of (a) the intensities, and (b) the amplitudes, of an earthquake P wave passing through the Earth and detected at two points 15 km and 45 km from the source?
A sailor strikes the side of his ship just below the surface of the sea. He hears the echo of the wave reflected from the ocean floor directly below 2.4 s later. How deep is the ocean at this point?
In Problem 55 (Fig. 11–55), the length l of the string may be adjusted by moving the pulley. If the hanging mass m is fixed at 0.080 kg, how many different standing wave patterns may be achieved by varying l between 10 cm and 1.5 m?
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