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Aim

Theory

Pretest

Procedure

Simulation

Posttest

References

Feedback

Sound level meter and its applications

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Decibel is a unit of ______.

a: sound pressure level only Explanation

Explanation

b: any quantity in which the ratio of two numbers is 2.0. Explanation

Explanation

c: any quantity which is represented by the natural logarithm of the measured quantity with respect to the reference quantity. Explanation

Explanation

d: any quantity which is represented as 10 times the logarithm of the measured quantity with respect to the reference signal. Explanation

Explanation

Two automobile whistles of 100 dB are blown at the same time. Their resultant SPL would be

a: 100 dB Explanation

Explanation

b: 203 dB Explanation

Explanation

c: 103 dB Explanation

Explanation

d: 110 dB Explanation

Explanation

Zero decibel SPL represents

a: the lowest pressure fluctuation normally discernible by human beings Explanation

Explanation

b: zero acoustic pressure Explanation

Explanation

c: zero acoustic power Explanation

Explanation

d: none of the above Explanation

Explanation

The SPL corresponding to one atmospheric pressure (1.013 bar) is

a: 194 dB Explanation

Explanation

b: 150 dB Explanation

Explanation

c: 174 phons Explanation

Explanation

d: 150 phons Explanation

Explanation

The sound pressure level of a sound source at double the distance would

a: become one-half Explanation

Explanation

b: become one-quarter Explanation

Explanation

c: be reduced by 6 dB Explanation

Explanation

d: be reduced by 3 dB Explanation

Explanation

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