A standing sound wave is induced in a pipe as shown above.  Identify the type of tube if the animation shows the displacement of the air molecules.  Position and time units are arbitrary.

Pressure is shown for a standing wave in a pipe that is open at one end and closed at the other.   Identify the harmonic. Distance is measured in meters and time is measured in milliseconds.

Displacement is shown for a standing wave in a pipe that is open at both ends.   Distance is measured in meters and time is measured in milliseconds. The animation shows the displacement in slow motion.  What is the frequency of the next higher harmonic?  The pipe is not necessarily filled with air.

Two tuning forks are caused to vibrate at different frequencies.  Although each tuning fork emits a steady tone, a beat frequency is heard when both tuning forks emit simultaneously.   Observe the pressure variation due to the first tuning fork, the second tuning fork, and both tuning forks.  What is the frequency difference between the tuning forks?  Distance is measured in meters and time in milliseconds. Start

The animation shows how the waves in the top and middle panels add together to create a beat pattern in the bottom panel.   Which of the following statements is true? Start

Source 1 and source 2 in the above animation produce wave crests at the same time.  Which of the following statements is true when both sources are turned on? Start

A wave is emitted by a moving source as shown above.  What frequency is observed in front of the source?  Time is measured in milliseconds and distance is measured in meters.

A wave is emitted by a moving source as shown above.  What frequency is observed behind the source?  Time is measured in milliseconds and distance is measured in meters.

A wave is emitted by a moving source as shown above.  What frequency is observed if the source were at rest?  Distance is measured in meters and time in milliseconds.

A wave is emitted by a moving source as shown above.  What is the ratio of the speed of the source to the speed of the wave?

A sonic ranger emits short pressure pulses as shown in the top panel.  These pulses are reflected from an object that is located past the right hand side of the screen.  How fast and in what direction is this object moving.  Time is measured in milliseconds and distance is measured in meters.