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College Physics
11th Edition
ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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
Transcribed Image Text:2. Suppose the intensity of sound of a jet during takeoff is 100 watts/m². What
is the corresponding sound intensity in decibels? How much more intense is
this sound than the least audible sound a human can hear?
3. A 1-liter solution contains 10-8 moles of hydrogen ions. Determine whether
the solution is acidic, neutral, or basic.
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- 10. The speed of sound in air is 343.2 m/s at 20 °C. You design experiments using three different types of techniques and equipment to measure the speed of sound yourself. You collect the following sets of experimental data (four measurements, or trials, for each of your three techniques). Which trial provides good precision but poor accuracy? a. trial 1: 346 m/s, 356 m/s, 334 m/s, 329 m/s b. trial 2: 374 m/s, 373 m/s, 371 m/s, 373 m/s c. trial 3: 345 m/s, 344 m/s, 342 m/s, 341 m/s d. trial 1: 313 m/s, 333 m/s, 353 m/s, 363 m/s e. more than one of the above provides precision but not accuracyarrow_forward1. The noise from a power mower was measured at 109 dB. The noise level at a rock concert was measured at 118 dB. Find the ratio of the intensity of the rock music to that of the power mower. (Round your answer to the nearest whole number.) 2. The decibel level of the sound of a subway train was measured at 98 dB. Find the intensity in watts per square meter (W/m2). (Give your answer in scientific notation, correct to one decimal place.) (blank) × 10(blank) W/m2arrow_forward5. The sound intensity from a jack hammer breaking concrete is 2.30 W/m² at a distance of 1.80 m from the point of impact. This is sufficiently loud to cause permanent hearing damage if the operator doesn't wear ear protection. What is the sound intensity for a person watching from 43.0 m away? X 95.05) W/m2 36 S 6 skp1 36 skplsarrow_forward
- 2. Emma needs to know the fundamental frequency of a guitar string. She sounds the string together with an 840Hz tuning fork, and counts 15 beats in 5.0s. She then sounds the string with an 835Hz tuning fork and counts 2 beats every second. What is the frequency of the string?arrow_forward2. Two boys are whispering in the library. The radiated sound power from one boy's mouth is 1.2 × 10-9 W and it spreads out uniformly in all directions. What is the minimum distance the boys must be away from the librarian so that she will not be able to hear them? The threshold of hearing for the librarian is 1.00 x 10-12 W/m².arrow_forward
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