题目内容
（请给出正确答案）
Decibel is
A．the unit for measuring the4ntensity of sound.
B．the pressure of radiating waves.
C．the frequency of radiating waves.
D．the speed of sound.
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更多“Decibel isA．the unit for measu…”相关的问题
A.a unit
B.is a unit
C.a unit is
D.a unit being
A、volts
B、octaves
C、decibel
D、radians per second
Which of the following about decibel is correct？
[A] It's a unit for measuring the intensity of sound.
[B] It's the pressure of radiating waves.
[C] It's the frequency of radiating waves.
[D] It's the speed of sound.
Which of the following is discussed in the third paragraph？
A．The same noise level produces a different effect on land and in the ocean.
B．Different places may have different types of noises.
C．The decibel is not a suitable unit for measuring underwater noise.
D．Different ocean animals may have different reactions to noises.
Decibel might be ______.
A．an effect of noise on human behavior
B．a person's distance to a noise source
C．a degree of deafness caused by noise
D．a measure of the loudness of sound
DECIBEL: SOUND::
A．color : light
B．wavelength : spectrum
C．newton : force
D．altitude : altimeter
E．diameter : cylinder
The intensity of noise can be measured by ______.
A．its effect on people's hearing
B．its decibel
C．how much it affects people psychologically
D．how long it lasts
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