1) You have two air columns that are each 2.210 m long. One column is open at both ends and the other is closed at one end. You wish to determine the frequencies you can produce in the audible range (20 Hz–20,000 Hz) on a day when the temperature of the air is at 16.00°C. (Give your answers to at least four significant figures. Assume that the speed of sound at 0° C is exactly 331 m/s.)
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(a) in the column that is open at both ends
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lowest frequency _________Hz
Second lowest frequency ________Hz
highest frequency ________Hz
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(b) in the column that is closed at one end
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lowest frequency _________Hz
Second lowest frequency ________Hz
highest frequency ________Hz
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2) What sound levels must sounds of the following frequencies have in order to have the same loudness as a 40 dB sound of frequency 1000 Hz (that is, to have a loudness of 40 phons)? Refer to the figure below. (See picture attached below)
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150 Hz -> _______ dB
2000 Hz -> _______ dB
10000 Hz -> _______ dB
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3) A diagnostic ultrasound echo is reflected from moving blood and returns with a frequency 488 Hz higher than its original 2.00 MHz. What is the velocity of the blood? (Use 1540 m/s as the speed of sound through human tissue.)
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________m/s
Answers
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Posted 20 Apr 2017 12:04 AM
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