sound source moves through air toward a stationary observer.  The frequency of the sound the observer hears is 20% higher than the source frequency. How fast is the observer moving?

You are driving at 30 m/s away from a police cruiser that is chasing you. You hear the siren as 412 Hz, but you know that particular siren was manufactured to produce a sound of 400 Hz. How fast is the police car going?

A giant sea monster chases a deep sea submarine near the bottom of the North Atlantic.  The submarine is moving at 30 m/s.  The sea monster sends out a sonar signal (sound) of frequency 1000 Hz.  The signal received by the sub has a frequency of 985 Hz.  The speed of sound in saltwater is 1530 m/s.  Determine the speed of the sea monster _________________ and if the sub is in trouble (yes or no)___________________

Sound is detected when a sound wave causes the eardrum to vibrate. Typically, the diameter of the eardrum is about 8.0mm in humans. When someone yells to you in a noisy environment, the sound intensity at your ear sometimes approximates 2 x 10-6 W/m2. Suppose that the 2 x 10-6 W/m2 of sound you are hearing comes from a janitor cleaning a rug by pulling a vacuum cleaner (at the end of a 1-meter-long tube oriented perpendicularly to the line separating you from the janitor). This person is yelling just over the din of the appliance in order to be heard by you. Estimate the distance between you and the janitor

A sound source is generating a sound with frequency 246 Hz. If an observer is moving toward the sound source at the speed of 17.1 m/s and the sound source is stationary, what is the apparent frequency of the sound the observer hears? Use 340 m/s for the speed of sound wave in air.

On a hot summer day, the temperature in Anchorage reaches 75 degrees Fahrenheit. What is the speed of sound at this temperature? A: 98 m/s B: 290.4 m/s C: 173.5 m/s D: 345 m/s E: 360 m/s

A bat can detect small objects, such as an insect, whose size is approximately equal to one wavelength of the sound the bat makes. If bats emit a chirp at a frequency of 7.69  104 Hz, and if the speed of sound in air is 343 m/s, what is the smallest insect a bat can detect? ?mm

A sound source with a frequency of 725 Hz moves away from a stationary observer at a rate of 15m/s. What frequency does the observer hear?

Two trains approach each other, each train traveling at 26 m/s.  The engineer on one train sounds his horn which has a frequency of 163Hz.  What frequency does a passenger on the second train hear? Use 340 m/s for the speed of sound in air

A sound wave of the form s = Sm cos(kx - wt + p) travels at 344 m/s through air in a long horizontal tube. At one instant, air molecule A at x = 2.03 m is at its maximum positive displacement of 6.00 nm and air molecule B at x = 2.08 m is at a positive displacement of 2.30 nm. All the molecules between A and B are at intermediate displacements. What is the frequency of the 17013 wave? Number Units *1