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A water wave has a frequency of 6 Hz and a wavelength of 3 m. (a) What is the period of these waves? (b) What is the wave velocity? |
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2 | |
The lower frequency limit for human hearing is usually considered to be 20.0 Hz. What is the corresponding wavelength for this frequency if the air temperature is 20.0 C? |
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3 | |
A 520 Hz tone is sounded at the same time as a 516 Hz tone. How many beats per second will you hear? |
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4 | |
The low range of frequencies used for medical applications is about 1,000,000 Hz. What is the wavelength of this frequency in air? |
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5 | |
How much time will elapse between seeing and hearing an event that happens 400.0 meters from you? |
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6 | |
An echo bounces from a building exactly 1.00 s after you honk your horn. How many feet away is the building if the air temperature is 20.0°C? |
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7 | |
A submarine sends a sonar signal, which returns from another ship 2.250 s later. How far away is the other ship if the speed of sound in seawater is 1,530.0 m/s? |
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8 | |
A student under water clicks two rocks together and makes a sound with a frequency of 600.0 Hz and a wavelength of 2.5 m. What is the speed of this underwater sound? |
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9 | |
You see condensed steam expelled from a ship's whistle 2.50 s before you hear the sound. If the air temperature is 20.0°C, how many meters are you from the ship? |
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10 | |
Compare the distance traveled in 6.00 s as a given sound moves through (a) water at 25.0°C, and (b) through seawater at 25.0°C. |
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11 | |
A tuning fork vibrates 440.0 times a second, producing sound waves with a wavelength of 78.0 cm. What is the velocity of these waves? |
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12 | |
The distance between the center of a condensation and the center of an adjacent rarefaction is 65.23 cm. If the frequency is 256.0 Hz, how fast are these waves moving? |
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13 | |
A warning buoy is observed to rise every 5.0 s as crests of waves pass by it. (a) What is the period of these waves? (b) What is the frequency? |
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14 | |
Sound from the siren of an emergency vehicle has a frequency of 750.0 Hz and moves with a velocity of 343.0 m/s. What is the distance from one condensation to the next? |
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15 | |
The following sound waves have what velocity?
(a) 20.0 Hz, λ of 17.15 m
(b) 200.0 Hz, λ of 1.72 m
(c) 2,000.0 Hz, λ of 17.15 cm
(d) 20,000.0 Hz, λ of 1.72 cm |
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16 | |
How much time is required for a sound to travel 1 mile (5,280.0 ft) if the air temperature is:
(a) 0.0°C
(b) 20.0°C
(c) 40.0°C
(d) 80.0°C |
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17 | |
A ship at sea sounds a whistle blast, and an echo returns from the coastal land 10.0 s later. How many km is it to the coastal land if the air temperature is 10.0°C? |
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18 | |
How many seconds will elapse between seeing lightning and hearing the thunder if the lightning strikes 1 mile (5,280 ft) away and the air temperature is 90.0°F? |
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19 | |
A 600.0 Hz sound has a velocity of 1,087.0 ft/s in the air and a velocity of 4,920.0 ft/s in water. Find the wavelength of this sound (a) in the air, (b) in the water. |
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