Kundt’s method for measuring the speed of sound . In Fig. 17-51. a rod R is clamped at its center; a disk D at its end projects into a glass tube that has cork filings spread over its interior. Aplunger P is provided at the other end of the tube, and the tube is filled with a gas. The rod is made to oscillate longitudinally at frequency f to produce sound waves inside the gas, and the location of the plunger is adjusted until a standing sound wave pattern is set up inside the tube. Once the standing wave is set up, the motion of the gas molecules causes the cork filings to collect in a pattern of ridges at the displacement nodes. If f = 4.46 × 10 3 Hz and the separation between ridges is 9.20 cm, what is the speed of sound in the gas? Figure 17-51 Problem 107.
Kundt’s method for measuring the speed of sound . In Fig. 17-51. a rod R is clamped at its center; a disk D at its end projects into a glass tube that has cork filings spread over its interior. Aplunger P is provided at the other end of the tube, and the tube is filled with a gas. The rod is made to oscillate longitudinally at frequency f to produce sound waves inside the gas, and the location of the plunger is adjusted until a standing sound wave pattern is set up inside the tube. Once the standing wave is set up, the motion of the gas molecules causes the cork filings to collect in a pattern of ridges at the displacement nodes. If f = 4.46 × 10 3 Hz and the separation between ridges is 9.20 cm, what is the speed of sound in the gas? Figure 17-51 Problem 107.
Kundt’s method for measuring the speed of sound. In Fig. 17-51. a rod R is clamped at its center; a disk D at its end projects into a glass tube that has cork filings spread over its interior. Aplunger P is provided at the other end of the tube, and the tube is filled with a gas. The rod is made to oscillate longitudinally at frequency f to produce sound waves inside the gas, and the location of the plunger is adjusted until a standing sound wave pattern is set up inside the tube. Once the standing wave is set up, the motion of the gas molecules causes the cork filings to collect in a pattern of ridges at the displacement nodes. If f = 4.46 × 103 Hz and the separation between ridges is 9.20 cm, what is the speed of sound in the gas?
35. ssm The speed of a sound in a container of hydrogen at 201 K is
1220 m/s. What would be the speed of sound if the temperature were
raised to 405 K? Assume that hydrogen behaves like an ideal gas.
3 In Fig. 17-26, three long tubes
(A, B, and C) are filled with differ-
ent gases under different pressures.
The ratio of the bulk modulus to the
16B,/Po
density is indicated for each gas in
terms of a basic value Balpg. Each
tube has a piston at its left end
that can send a sound pulse
through the tube (as in Fig. 16-2).
The three pulses are sent simulta-
neously. Rank the tubes according
to the time of arrival of the pulses
at the open right ends of the tubes,
4B/Po
By/Po
C.
earliest first.
Figure 17-26 Question 3.
Estimate the speed of sound in air at standard temperature and pressure. The mass of 1 mole of air is 29.0 ×10-3 kg.
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