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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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Two out-of-phase radio antennas at x = 300 m on the x-axis are emitting 3.0 MHz radio waves. Is the point (x, y) = (300 m, 800 m) a point of maximum constructive interference, maximum destructive interference, or something in between
The 40-cm-long tube of FIGURE P17.54 has a 40-cm-long insert
that can be pulled in and out. A vibrating tuning fork is held next to the
tube. As the insert is slowly pulled out, the sound from the tuning fork
creates standing waves in the tube when the total length L is 42.5 cm, 56.7 cm, and 70.9 cm. What is the frequency of the tuning fork? Assume vsound = 343 m/s.
Two loudspeakers emit 400 Hz notes. One speaker sits on the
ground. The other speaker is in the back of a pickup truck. You
hear eight beats per second as the truck drives away from you.
What is the truck’s speed?
FIGURE EX17.27 shows the circular wave fronts emitted by two
wave sources.
a. Are these sources in phase or out of phase? Explain.
b. Make a table with rows labeled P, Q, and R and columns
labeled and C/D. Fill in the table for points P, Q, and
R, giving the distances as multiples of l and indicating, with a
C or a D, whether the interference at that point is constructive
or destructive.
Ultrasound has many medical applications, one of which is to monitor fetal heartbeats by reflecting ultrasound off a fetus in the womb.
a. Consider an object moving at speed toward an at-rest source that is emitting sound waves of frequency . Show that the reflected wave (i.e., the echo) that returns to the source has a Doppler-shifted frequency
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