Wave Intensity and Decibel - 题库网 (tiku.one)

1#

13.34: Which one of the following choices represe8fof 72p;hqgents the base MKS units for sound intensitq8 72 gpoefh;fy?

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2#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

06.31: A sound increases its decibel reading from 20 to6t0i o, apm v(t(w:avl 40 dB. This means that the(w( :tvvlp6t,a0oami intensity of the sound

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3#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

00.31: The average signal to noise ratio for a particulqj*t-ad; :fx qar tape recorder is 50 decibels. This meansqxj; -:d *ftqa that the loudness of an average reproduced signal is about how many times louder than the loudness of the tape noise?

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4#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

01.35: The intensity of sound 10 metersw42xlvu;o r *721gekd w/swam from a tornado siren is a very loud 130 decibels. At what distance would you need to be for the intensity to drop toau w* r2x;w7vo2gled kw14 sm/ 90 decibels?

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5#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

05.23: A person hears a single-frequencle- 4m sqh1b.xy sound from a speaker that emits sound uniformly in all directions. The personx. sm blhqe4-1 records the decibel level reading. Which of the following processes would increase the decibel reading the most?

A. The power output of the speaker is doubled.

B. The distance of the person to the speaker is halved.

C. The frequency of the sound is doubled.

D. The temperature of the air is doubled on the Kelvin scale.

E. The area over which the sound is transmitted is halved.

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