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Chapter 16: Q. 1 (page 451)
The wave speed on a string under tension is 200 m/s. What is the speed if the tension is halved?
The new speed of the wave is 141.4 m/s
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A concert loudspeaker suspended high above the ground emits 35 W of sound power. A small microphone with a 1.0 cm2 area is 50 m from the speaker. a. What is the sound intensity at the position of the microphone? b. How much sound energy impinges on the microphone each second?
The string in FIGURE P16.60 has linear density . Find an expression in terms of M, , and for the speed of waves on the string.
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?
A distant star system is discovered in which a planet with
twice the radius of the earth and rotating 3.0 times as fast as the
earth orbits a star with a total power output of .
a. If the star’s radius is 6.0 times that of the sun, what is the
electromagnetic wave intensity at the surface? Astronomers
call this the surface flux. Astronomical data are provided
inside the back cover of the book.
b. Every planet-day (one rotation), the planet receives.
of energy. What is the planet’s distance from its star? Give
your answer in astronomical units (AU), where 1 AU is the
distance of the earth from the sun.
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