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1. A person holds a rifle horizontally and fires at a target. The bullet has a muzzle speed of 195 m/s, and the person hears the bullet strike the target 0.80 s after firing it. The air temperature is 69F. What is the distance to the target? m 2. A hiker shouts and hears the echo reflected from a cliff wall 3.90 s later. If the air temperature is 15.C, how far is the hiker from the cliff? (Assume no wind.) m 3. The driver of a truck parked on a mountain road give the air horn a quick blast toward a rock cliff 0.600 km away. If he hears the echo 3.45 s later, what is the approximate air temperature at this mountain elevation? .C 4. A bystander hears a siren vary in frequency from 594 Hz to 364 Hz as a fire truck approaches, passes by, and moves away on a straight street. What is the speed of the truck? (Take the speed of sound in air to be 343 m/s.) m/s 5. By how many decibels do you reduce the sound intensity level due to a source of sound if you quadruple your distance from it? Assume that the waves expand spherically. 6. What would be the intensity level of a 55-decibel sound after being amplified a million times? dB 7. A dB meter registers 128 dB when placed 1.60 m in front of a loudspeaker. Assuming uniform spherical spreading of the sound, how far away would the intensity level be a somehow reasonable 75 dB? m 8. A person standing a certain distance from nineteen identical loudspeakers is hearing a sound level intensity of 116 dB. What sound level intensity would this person hear if three are turned off? dB 9. The sound intensity from a jack hammer breaking concrete is 2.50 W/m? at a distance of 2.00 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 level for a person watching from 39.0 m away? dB 10. A trailer truck traveling east at 38.0 m/s sounds a 800 Hz horn. What is the wavelength of the sound heard by a stationary listener located west of the truck? (The speed of sound is 337 m/s) meters