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

1#

13.34: Which one of the following choices represents the base MKS units for 0xeg z 6gncb9/shsu4 ,sound intb/ g0s9 gcnex h6u4s,zensity?

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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 to 40 dB. This means that -mu xgbud6ui5b5e)9nthe intensity 69b5gi uxund-b5)meu 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 noisd liq84wbo:r qt-7 o.fe ratio for a particular tape recorder is 50 decibels.qfd :btw-i.q oo rl487 This means 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 loud 1q i60c:r5rgwd 30 decibels. At what distance would you need to r0d6crgiq :5w 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 sound from a spe .qd cs2qtn8+-tfkz b8aker that emits sound uniformly in allqtdf .8bq+28kzs c-t n directions. 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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