Exam 17: Waves II

Two sound waves are traveling through the same medium.They have the same amplitude, wavelength, and direction of travel.If the phase difference between them is 7π, the type of interference they exhibit is:

This graph shows the position of an element of air as a function of time as a sound wave passes through it.Which letter corresponds to the period of the wave?

If the sound level is increased by 10 db the intensity increases by a factor of:

A stationary source generates 5.0 Hz water waves whose speed is 2.0 m/s.A boat is approaching the source at 1.0 m/s.The frequency of these waves, as observed by a person in the boat, is:

If I₀ = 10^-12 W/m², and I = 4.5 x 10^-8 W/m², what is log (I/I₀)?

A stationary source emits a sound wave of frequency f.If it were possible for a man to travel toward the source at the speed of sound, he would observe the emitted sound to have a frequency of:

The standard reference sound level is about:

During a time interval of exactly one period of vibration of a tuning fork, the emitted sound travels a distance:

Two identical strings, A and B, have nearly the same tension.When they both vibrate in their fundamental resonant modes, there is a beat of 3 Hz.When string B is tightened slightly, to increase the tension, the beat frequency becomes 6 Hz.This means:

The intensity of sound wave A is 100 times that of sound wave B.Relative to wave B the sound level of wave A is: