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Chapter 16: Q. 28 (page 452)
The density of mercury is 13,600 kg/m3 . What is the speed of sound in mercury at 20°C?
The speed of sound in mercury atis.
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Wavelengths of light from a distant galaxy are found to be 0.50% longer than the corresponding wavelengths measured in a terrestrial laboratory. Is the galaxy approaching or receding from the earth? At what speed?
Cell phone conversations are transmitted by high-frequency radio waves. Suppose the signal has wavelength 35 cm while traveling through air. What are the (a) frequency and (b) wavelength as the signal travels through 3-mm-thick window glass into your room?
The displacement of a wave traveling in the negative y-direction is , where y is in m and t is in s.
What are the (a) frequency, (b) wavelength, and (c) speed of this wave?
One physics professor talking produces a sound intensity level of 52 dB. It’s a frightening idea, but what would be the sound intensity level of 100 physics professors talking simultaneously?
The wave speed on a string is 150 m/s when the tension is 75 N. What tension will give a speed of 180 m/s?
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