Chapter 31.6, Problem 1FE

What is the sound level of a sound wave with intensity 6.40 105 W/m2?

A piano tuner uses a 512-Hz tuning fork to tune a piano. He strikes the fork and hits a key on the piano and hears a beat frequency of 5 Hz. He tightens the string of the piano, and repeats the procedure. Once again he hears a beat frequency of 5 Hz. What happened?

A siren mounted 011 the roof of a firehouse emits sound at a frequency of 900 Hz. A steady wind is blowing with a speed of 15.0 m/s. Taking the speed of sound in calm air to be 343 m/s. find the wavelength of the sound (a) upwind of the siren and (b) downwind of the siren. Firefighters are approaching the siren from various directions at 15.0 m/s. What frequency does a firefighter hear (c) if she is approaching from an upwind position so that site is moving in the direction in which the wind is blowing and (d) if she is approaching from a downwind position and moving against the wind?

The area of a typical eardrum is about 5.0 105 m2. Calculate the sound power (the energy per second) incident on an eardrum at (a) the threshold of hearing and (b) the threshold of pain.

The coldest and hottest temperatures ever recorded in Switzerland are -43.2°F (231 K) and 106.7°F (315 K), respectively. What is the speed of sound in air (in m/s) at each temperature? speed of sound at -43.2°F m/s speed of sound at 106.7°F m/s

The speed of sound in steel is about 5,130 m/s. If a charge of dynamite is set off near a railroad track, how long will it take before a person with their ear to the steel rail to hear the sound if they are 8 km from the point of the explosion? The answer is 1.5 s (compared to ~23 s via air on a 20 degree celcius day)  I just need to learn how to get to this answer, please.

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The frequency separating audible waves and ultrasonic waves is considered to be 20 kHz. What wavelength in air at room temperature is associated with this frequency? (Assume the speed of sound to be 340 m/s.)

A ship sends a signal out to determine the depth of the ocean. The signal returns 2.5seconds later. If sound travels at 1450 m.s−1 in sea water, how deep is the ocean at that point? Convert your answer into kilometers.