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

1#

13.34: Which one of the following choices represents the base MKS units for sr 81 yz7rwc4luound intens871ruw y zl4rcity?

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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 re aj; +d-60a kfnpkzzo uh1(ej7ading from 20 to 40 dB. This means that the int u;af-a6z zkj(d0 71e +khojpnensity 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 particular tapeipe ;q78j0mlm xsc6v- recorder is 50 decibels. This means that the loudness of avi0 ;j7-mc8 6 pxmqesln 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 thyy43 ,p 4c9atq1ng pt.9ckwy ornado siren is a very loud 130 decibels. At what distance would you need to be for thy ahy9nw 49t p.c34qpk,tgyc1e 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 single-frequency sound from a speaker t 01 kua2ay/wwxhat emits sound uniformly in all directionswx 2awkua0/ 1y. The person 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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