Wave Intensity and Decibel - 无忧得胜-网上国际课程 (5edu.win)

1#

13.34: Which one of tt0whbd z t7l7:js7h5lhe following choices represents the base MKS units for sound intensiwd50tb7 lh: js 7hz7tlty?

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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 readinoq1 i0q7ojc ,r 8meg2gg from 20 to 40 dB. This means that the intensity of the soundjq0g28o qg71cm, orie

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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 particula(vu (3kf df5wpr tape recorder is 50 decibels. This means that the loudness of an average3 f (pfd5(uvwk 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 sireqr88 g z,cg1dfjun6 fi22xx;h ;qg8kz n is a very loud 130 decibejg,gd ifngqzf 8286xh2ru8k ; x czq;1ls. 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 single-frequency sou9 rljvju:17 qrnv+;)lqlb 1 tfnd from a speaker that emits sound uniformly in all directions. The person records the decibel level reading. Whicl)1 qqul t9vjj;lv1b+7:nrfr h 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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本习题练习题目来源于无忧得胜-网上国际课程 (https://5edu.win)，学生可刷题练习，扫右侧二维码或加微信skysky1258，获取更多资料
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