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

1#

13.34: Which one of the fo/1p k.r4mzek)rum , qallowing choices represents the base MKS units for sound intensityp u)/rekqm4kamr1.z , ?

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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 vsi25fz 21 l,3 ij4u;ylokng tits decibel reading from 20 to 40 dB. This means that the intensity of the sg3 li,ji 5vkftn l 2os;uy41z2ound

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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 particular tape /,249s kxzzcxjw a2xs recorder is 50 decibels. This meansz,sj2 xxxsk4 z/ac9w2 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 meters from a tornado siren is a very l/ , z xo7jfd8zp.hjk/i( rh*yxoud 130 decibe*zh/8x ifo (kxy.r,/jzpdhj 7ls. At what distance would you need to be for the intensity to drop to 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 sinqvp e9w+ re:xel **3lhgle-frequency sound from a speaker that emits sound uniformly in all directions. The person records the decibel level reading. Which of the folloq3x9 * eel: +r*pvhwelwing 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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