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

1#

13.34: Which one of the following choices representsxnh(rmbkq8 *hn5lmc:3 6 2onm the base MKS units for sounnh5b8 nxmhlq(r6k mnmc: 3* 2od intensity?

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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 t0hmhxrh iobb83 t018its decibel reading from 20 to 40 dB. This means that the i8ohihmtb 0h x108btr3 ntensity 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 tape recorder is :pi.l7 ;ryq7q0fgynm ktky.5 50 decibels. This means that the loudness of an average reproduced signal is about how many times louder than the lou7n0iryqfkql:g; y7 p .m.kty5 dness 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 sird1m5 gdbq,o bgcfm amps e1*g15h)7 q(en is a very loud 130 decibels. At what distance would you need to be for thgd mbhs5pqgdoamg,71 bfme5)c 1*q1( e 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 spa7uj02tu in 8leaker that emits sound uniformly in all directions. T2ul i8uanj7t0 he 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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