Chapter 6: SPI Study Guide

Every 3 dB change mean that the intensity will

• double

• ten times larger

• half

• one-tenth

Every 10 dB change means that the intensity will

• double

• ten times larger

• half

• one-tenth

A reduction in the intensity of a sound beam to one-half of its original value is

• 3 dB

• 10 dB

• -3 dB

• -10 dB

A reduction in the intensity of a sound beam to one-tenth of its original value is

• 3 dB

• 10 dB

• -3 dB

• -10 dB

A reduction in the intensity of a sound beam to one-quarter of its original value is

• -3 dB

• -6 dB

• -10 dB

• -20 dB

What is a decibel?

• the absolute value of a number

• a range of values

• a relationship between two numbers

• none of the above

Decibel notation is a ___ between two numbers

• difference

• sum

• product

• ratio

How many decibels represent a 100-fold increase in the intensity of an acoustic pulse?

• 10

• 20

• 100

• 6

What units are used to describe attenuation?

• watts

• watts/cm²

• macro

• decibels