During a thunderstorm, 4.1 s elapses between observing a lightning flash and hearing the resulting thunder. Approximately how far away in kilometers and miles was the lightning flash? (Assume the speed of sound is 344 m/s.)

The relationship between the number of decibles B and the intensity I in watts per square meteris denoted by the equation B = 10log(10^12 x I). If the intensity of a given sound is increased by a factor of 100, by how much does the number of decibels increase?

While rolling down a hill, you produce a pitch of 387 Hz while honking on your horn. A stationary car blows it's horn at the same frequency. The combined sound of the two horns is 49 Hz. How do we calculate my speed in this scenario?

An explosion occurs at the end of a pier. The sound reaches the other end of the pier by traveling through three media: air, fresh water, and a slender metal handrail. The speeds of sound in air, water, and the handrail are 346, 1400, and 5480 m/s, respectively. The sound travels a distance of 142 m in each medium. (a) After the first sound arrives, how much later does the second sound arrive? (b) After the first sound arrives, how much later does the third sound arrive? (a) Number i (b) Number i Units Units

The sound intensity of a jet engine, measured in watts per meter squared (W/m2), is inversely proportional to the square of the distance between the engine and an airport ramp worker. For a certain jet, the sound intensity measures 0.6 W/m2 at a distance of 8 meters from the ramp worker. What is the sound intensity (in W/m2) for a ramp worker 10 meters from the jet?

The warning tag on a lawn mower states that it produces noise at a level of 99.0 dB. What is this in W/m2?

Suppose you hear a clap of thunder 8.20 s after seeing the associated lightning strike. The speed of light in air is 3.00 ✕ 108 m/s. (a) How far are you from the lightning strike? (The speed of sound waves in air is 343 m/s.)

A group of hikers hears an echo 4.60 s after shouting. How far away is the mountain that reflected the sound wave? (Assume the speed of sound is 342 m/s.)

A bystander hears a siren vary in frequency from 590 Hz to 368 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.)

A supersonic jet traveling at Mach 2.80 at an altitude of h = 21,000 m is directly over a person at time t = 0 as shown in the figure below. Assume the average speed of sound in air is 335 m/s over the path of the sound. t=0 t=? Observer hears Observer the "boom" (a) At what time will the person encounter the shock wave due to the sound emitted at t = 0? (b) Where will the plane be when this shock wave is heard? (Give the plane's horizontal displacement x.) km