One closed organ pipe has a length of 2.40 m. a. What is the frequency of the note played by this pipe? b. When a second pipe is played at the same time, a 1.40-Hz beat note is heard. By how much is the second pipe too long?

(a) What should be the length of an organ pipe, closed at one end, if the fundamental frequency is to be 261.5 Hz? (b) What is the fundamental frequency of the organ pipe of part (a) if the temperature drops to

$$0.0 ^ { \circ } \mathrm { C } ?$$

The fundamental frequency of an open organ pipe corresponds to middle C (261.6 Hz on the chromatic musical scale). The third resonance of a closed organ pipe has the same frequency. What is the length of (a) the open pipe and (b) the closed pipe?

For the underlined phrase or sentence, choose the revision that most improves the writing. $\underline{\text { Her name is ‘Mique, don’t believe it.}}$ Chamique Holdsclaw is anything but meek, She's a powerhouse. A. Her nickname is 'Mique don't believe it. B. Just because her nickname is 'Mique don't believe it. C. Her nickname is 'Mique, but don't believe it. D. Correct as is.

Organ pipe A, with both ends open, has a fundamental frequency of 300 Hz. The third harmonic of organ pipe B, with one end open, has the same frequency as the second harmonic of pipe A. How long is pipe A?

How must the length of an open tube compare to the wavelength of the sound to produce the strongest resonance?

Two loudspeakers $42.0 \mathrm{~m}$ apart and facing each other emit identical $115 \mathrm{~Hz}$ sinusoidal sound waves in a room where the sound speed is $345 \mathrm{~m} / \mathrm{s}$. Susan is walking along a line between the speakers. As she walks, she finds herself moving through loud and quiet spots. If Susan stands $19.5 \mathrm{~m}$ from one speaker, is she standing at a quiet spot or a loud spot?

What is the vibrating object that produces sounds in each of the following? a. a human voice b. a clarinet c. a tuba d. a violin

The first three natural frequencies of an organ pipe are 126 Hz, 378 Hz, and 630 Hz. (a) Is the pipe an open or a closed pipe? (b) Taking the speed of sound in air to be 340 m/s, find the length of the pipe.

Why is the tube from which a tuba is made much longer than that of a cornet?

A student waiting at a stoplight notices that her turn signal which has a period of 0.85 s, makes one blink exactly in sync with the turn signal of the car in front of her. The blinker of the car ahead then starts to get ahead, but 17 s later the two are exactly in sync again. What is the period of the blinker of the other car?

When a sound wave travels directly toward a hard wall, the incoming and reflected waves can combine to produce a standing wave. There is an antinode right at the wall, just as at the end of a closed tube, so the sound near the wall is loud. You are standing beside a brick wall listening to a 50 Hz tone from a distant loudspeaker. How far from the wall must you move to find the first quiet spot? Assume a sound speed of 340 m/s.

A drainage pipe running under a freeway is 30.0 m long. Both ends of the pipe are open, and wind blowing across one end causes the air inside to vibrate. a. If the speed of sound on a particular day is 340 m/s, what will be the fundamental frequency of air vibration in this pipe? b. What is the frequency of the lowest harmonic that would be audible to the human ear? c. What will happen to the frequency in the later afternoon as the air begins to cool?

The eardrum moves back and forth in response to the pressure variations of a sound wave. Sketch a graph of the displacement of the eardrum versus time for two cycles of a 1.0-kHz tone and for two cycles of a 2.0-kHz tone.