Exam 17: Waves II

A source emits sound with a frequency of 1000 Hz. Both it and an observer are moving in the same direction with the same speed, 100 m/s. If the speed of sound is 340 m/s, the observer hears sound with a frequency of:

A plane produces a sonic boom only when:

Five organ pipes are described below. Which one has the highest frequency fundamental?

The diagram shows four situations in which a source of sound S and a detector D are either moving or stationary. The arrows indicate the directions of motion. The speeds are all the same. Detector 3 is stationary. Rank the situations according to the frequency of the source, lowest to highest.

Which of the following properties of a sound wave determine its "pitch"?

The "A" on a trumpet and a clarinet have the same pitch, but the two are clearly distinguishable. Which property is most important in enabling one to distinguish between these two instruments?

A sound wave has a wavelength of 3.0 m. The distance from a compression center to the adjacent rarefaction center is:

A source emits sound with a frequency of 1000 Hz. It is moving at 20 m/s toward a stationary reflecting wall. If the speed of sound is 340 m/s an observer at rest directly behind the source hears a beat frequency of:

The speed of sound is 340 m/s. A plane flys horizontally at an altitude of 10,000 m and a speed of 400 m/s. When an observer on the ground hears the sonic boom the horizontal distance from the point on its path directly above the observer to the plane is:

You are listening to an "A" note played on a violin string. Let the subscript "s" refer to the violin string and "a" refer to the air. Then:

An organ pipe with one end closed and the other open has length L. Its fundamental frequency is proportional to:

The speed of sound in air is 340 m/s. The shortest air column, closed at one end, which will respond to a 512 Hz tuning fork is approximately:

A piano wire has a length of 81 cm and a mass of 2.0 g. If its fundamental frequency is to be 394 Hz, it tension must be:

Take the speed of sound to be 340 m/s. A thunder clap is heard about 3 s after the lightning is seen. The source of both light and sound is:

In order for two sound waves to produce audible beats, it is essential that the two waves have:

"Beats" in sound refer to:

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

When listening to tuning forks of frequency 256 Hz and 260 Hz, one hears the following number of beats per second:

If the speed of sound is 340 m/s a plane flying at 400 m/s creates a conical shock wave with an apex half angle of:

The sound level at a point P is 14 db below the sound level at a point 1.0 m from a point source. The distance from the source to point P is: