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Chapter 17: Q. 25 (page 458)
What is the thinnest film of on glass that
produces a strong reflection for orange light with a wavelength of 600 nm?
The thinnest film should be of thick that produces reflection of orange light.
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A particularly beautiful note reaching your ear from a rare Stradivarius violin has a wavelength of 39.1 cm. The room is slightly warm, so the speed of sound is 344 m/s. If the string’s linear density is 0.600 g/m and the tension is 150 N, how long is the vibrating section of the violin string?
Engineers are testing a new thin-film coating whose index of refraction is less than that of glass. They deposit a 560-nm-thick layer on glass, then shine lasers on it. A red laser with a wavelength of 640 nm has no reflection at all, but a violet laser with a wavelength of 400 nm has a maximum reflection. How the coating behaves at other wavelengths is unknown. What is the coating’s index of refraction?
Traditional Indonesian music uses an ensemble called a gamelan that is based on tuned percussion instruments somewhat like gongs. In Bali, the gongs are often grouped in pairs that are slightly out of tune with each other. When both are played at once, the beat frequency lends a distinctive vibrating quality to the music. Suppose a pair of gongs are tuned to produce notes at 151 Hz and 155 Hz. How many beats are heard if the gongs are struck together and both ring for 2.5 s?
FIGURE EX17.5 shows a standing wave oscillating at 100 Hz on a string. What is the wave speed?
In a laboratory experiment, one end of a horizontal string is tied
to a support while the other end passes over a frictionless pulley
and is tied to a 1.5 kg sphere. Students determine the frequencies
of standing waves on the horizontal segment of the string, then
they raise a beaker of water until the hanging 1.5 kg sphere is
completely submerged. The frequency of the fifth harmonic with
the sphere submerged exactly matches the frequency of the third
harmonic before the sphere was submerged. What is the diameter
of the sphere?
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