A grasshopper floating in water generates waves at a rate of three per second with a wavelength of two centimeters. (a) What is the period of these waves? (b) What is the wave velocity? Click here to see the answer
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The upper limit for human hearing is usually considered to be 20,000 Hz. What is the corresponding wavelength if the air temperature is 20.0°C? Click here to see the answer
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A tone with a frequency of 440 Hz is sounded at the same time as a 446 Hz tone. How many beats per second are produced? Click here to see the answer
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Medical applications of ultrasound use frequencies up to 2.00 × 107 Hz. What is the wavelength of this frequency in air? Click here to see the answer
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A baseball fan is 150.0 m from the home plate. How much time elapses between the instant the fan sees the batter hit the ball and the moment the fan hears the sound? Click here to see the answer
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An echo is heard from a building 0.500 s after you shout "Hello." How many feet away is the building if the air temperature is 20.0°C? Click here to see the answer
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A sonar signal is sent from an oceangoing ship and the signal returns from the bottom 1.75 s later. How deep is the ocean beneath the ship if the speed of sound in seawater is 1,530 m/s? Click here to see the answer
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A sound wave in a steel rail of a railroad track has a frequency of 660 Hz and a wavelength of 9.0 m. What is the speed of sound in this rail? Click here to see the answer
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According to the condensed steam released, a factory whistle blows 2.5 s before you hear the sound. If the air temperature is 20.0°C, how many meters are you from the whistle? Click here to see the answer
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A vibrating object produces periodic waves with a wavelength of 50 cm and a frequency of 10 Hz. How fast do these waves move away from the object? Click here to see the answer
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The distance between the center of a condensation and the center of an adjacent rarefaction is 1.50 m. If the frequency is 112.0 Hz, what is the speed of the wave front? Click here to see the answer
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Water waves are observed to pass under a bridge at a rate of one complete wave every 4.0 s. (a) What is the period of these waves? (b) What is the frequency? Click here to see the answer
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A sound wave with a frequency of 260 Hz moves with a velocity of 330 m/s. What is the distance from one condensation to the next? Click here to see the answer
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The following sound waves have what velocity? (a) Middle C, or 256 Hz and 1.34 m λ. (b) Note A, or 440.0 Hz and 78.0 cm λ. (c) A siren at 750.0 Hz and λ of 45.7 cm. (d) Note from a stereo at 2,500.0 Hz and λ of 13.72 cm. Click here to see the answer
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An echo is heard from a cliff 4.80 s after a rifle is fired. How many feet away is the cliff if the air temperature is 43.7°F? Click here to see the answer
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The air temperature is 80.00°F during a thunderstorm, and thunder was timed 4.63 s after lightning was seen. How many feet away was the lightning strike? Click here to see the answer
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If the velocity of a 440 Hz sound is 1,125 ft/s in the air and 5,020 ft/s in seawater, find the wavelength of this sound (a) in air, (b) in seawater. Click here to see the answer
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