hearing science quiz 3

Which of the statements is true

the decibel is the standard unit of measure of sound level

Identify the correct statement

power is the rate at which energy is transformed

intensity is the amount of energy transmitted per second over an area of one square

50 dB SPL= 50 db IL

true

If there are two sound sources in a room, each source generates 80 db. what is the overall intensity

83 dB

The unit of power is watt

true

Correct equation

intensity = power / area

According to the inverse square law " the sound energy per unit area recieved at any point is ___ proportional to the square of the distance from the sound source

Inversely

8.2 bels =

82 decibels

If there are 10 sound sources in a room, each source generates 70 db of noise. what will be the overall intensity level of noise in that room

80 dB

70 + 10 log (10)

An increase in sound pressure by a facotr of 2 corresponds to how many decibels

6 dB

20 log (x/r)

20 log 2

= 6.02

What is the sound pressure level of (210^1) upa of a sound with an absolute pressure of (210^4)

60 db

20 log (2x10^4/ 2x10 ^1)

20log(1000)

10 dB corresponds to what intensity ratio

10

10log x/r

10=logx

1=logx

10^1 =x=10

What is the intensity level (10^-12) watt of a sound with an intensity of (2*10^-6) watt

63

10log x/r

10(2*10^-6/ 10^-12)

An increase in intensity by a factor of 4 corresponds to how many decibels

6

10 log x

10 log 4

An increase in intensity by a factor of 10 corresponds to how many decibels

10

10log10