COLLEGE PHYSICS
2nd Edition
ISBN: 9781464196393
Author: Freedman
Publisher: MAC HIGHER
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Chapter 13, Problem 31QAP
To determine
(a)
The distance of sound in air.
To determine
(b)
Explain
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Question 25
In an experiment, two students measured the speed of sound in sea water at room
temperature (20°C). Both of the students recorded their results in their notebooks as
follows:
A) (1515 + 7)m/s
B) (1522 + 4) m/s
The students then looked up the value for the speed of sound in sea water and found
it to be 1531 m/s. Which of the following statements best describes the comparison
between the students' results and the accepted value for the speed?
The values that the two students found did not agree with each other, but one of
the student's answer did agree with the accepted value.
The values that the two students found agree with each other but not with the
accepted value.
The values that the two students found did not agree with each other, nor with
the accepted value.
The values that the two students found agree with each other and with the
accepted value.
The values that the two students found were wrong and should have agreed with
the accepted value.
= 424 m away. How long (in s) until the dolphin hears an echo? Assume the water temperature is 25°C, and
While floating in the ocean, a dolphin emits a sound wave directed toward the hull of an ocean liner d
the speed of sound in the water is 1,533 m/s.
S
Question 2
If the speed of sound in air at 0 °C is 331 m/s. What will be the speed of sound in air at 50 °C?
299 m/s
142 m/s
331 m/s
360 m/s
None of these.
A Moving to another question will
ave this response.
ch
45
Chapter 13 Solutions
COLLEGE PHYSICS
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- During a thunderstorm, a frightened child is soothed by learning to estimate the distance to a lightning strike by counting the time between seeing the lightning and hearing the thunder (Fig. P2.25). The speed vs of sound in air depends on the air temperature, but assume the value is 343 m/s. The speed of light c is 3.00 108 m/s. a. A child sees the lightning and then counts to eight slowly before hearing the thunder. Assume the light travel time is negligible. Estimate the distance to the lightning strike. b. Using your estimate in part (a), find the light travel time. Is it fair to neglect the light travel time? c. Think about how time was measured in this problem. Is it fair to neglect the difference between the speed of sound in cold air (vs at 0C = 331.4 m/s) and the speed of sound in very warm air (vs at 40C = 355.4 m/s)?arrow_forward(a) Seismographs measure the arrival times of earthquakes with a precision of 0.100 s. To get the distance to the epicenter of the quake, geologists compare the arrival times of S- and P-waves, which travel at different speeds. If S- and P-waves travel at 4.00 and 7.20 km/s, respectively, in the region considered, how precisely can the distance to the source of the earthquake be determined? (b) Seismic waves from underground detonations of nuclear bombs can be used to locate the test site and detect violations of test bans. Discuss whether your answer to (a) implies a serious limit to such detection. (Note also that the uncertainty is greater if there is an uncertainty in the propagation speeds of the S- and P-waves.)arrow_forwardIn Bosnia, the ultimate test of a young nuns courage used to be to jump off a 400-year-old bridge (destroyed in 1993; rebuilt in 2004) into the River Neretva, 23 m below the bridge. (a) How long did the jump last? (b) How fan was the jumper traveling upon impact with the river? (c) If the speed of sound in air is 340 m/s, how long after the jumper took off did a spectator on the bridge hear the splash?arrow_forward
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