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Chapter 17: Q. 12 (page 483)
A carbon dioxide laser is an infrared laser. A CO2 laser with a cavity length of 53.00 cm oscillates in the m = 100,000 mode. What are the wavelength and frequency of the laser beam?
The wavelength of the laser beam is .
The frequency of the laser beam is.
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What is the thinnest film of on glass that
produces a strong reflection for orange light with a wavelength of 600 nm?
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.
FIGURE EX17.28 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.
In 1866, the German scientist Adolph Kundt developed a
technique for accurately measuring the speed of sound in various gases. A long glass tube, known today as a Kundt鈥檚 tube, has a vibrating piston at one end and is closed at the other. Very finely ground particles of cork are sprinkled in the bottom of the tube before the piston is inserted. As the vibrating piston is slowly moved forward, there are a few positions that cause the cork particles to collect in small, regularly spaced piles along the bottom. FIGURE P17.53 shows an experiment in which the tube is filled with pure oxygen and the piston is driven at 400 Hz. What is the speed of sound in oxygen?
Piano tuners tune pianos by listening to the beats between the
harmonics of two different strings. When properly tuned, the note
A should have a frequency of 440 Hz and the note E should be
at 659 Hz.
a. What is the frequency difference between the third harmonic
of the A and the second harmonic of the E?
b. A tuner first tunes the A string very precisely by matching it to
a 440 Hz tuning fork. She then strikes the A and E strings simultaneously
and listens for beats between the harmonics. What
beat frequency indicates that the E string is properly tuned?
c. The tuner starts with the tension in the E string a little low,
then tightens it. What is the frequency of the E string when
she hears four beats per second?
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