Edelman exam review chapter 6

The logarithm of a numeral is defined as how many times ____ must be multiplied together to get that numeral.

• 1

• 2

• 5

• 10

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

Which of the following reports the relative strength of an ultrasound wave?

• decibels

• watts

• W/cm2

• pascals

The scale associated with decibel notation is ____.

• linear

• discrete

• logarithmic

• additive

What is the decibel representation when an acoustic signal is amplified?

• positive

• negative

• equal to zero

What is the decibel notation for an acoustic signal that is attenuated?

• positive

• negative

• equal to zero

The intensity of a signal declines from 1.5 mW/cm2 to 0.75 mW/cm2. How many decibels is this change in intensity?

• 3 dB

• 0.75 dB

• -0.75 dB

• -3 dB

The power in a wave is increased to ten times its original value. How many decibels describe this change?

• 3

• 6

• 10

• 20

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

• 10

• 20

• 100

• 6