- #1

- 15

- 0

Possible answers:

a) 2

b) 8

c) 16

d) 24

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- Thread starter tics
- Start date

- #1

- 15

- 0

Possible answers:

a) 2

b) 8

c) 16

d) 24

- #2

Integral

Staff Emeritus

Science Advisor

Gold Member

- 7,201

- 56

You need to show us some of your thoughts and effort put into this proplem.

- #3

- 15

- 0

Possible answers:

a) 2

b) 8

c) 16

d) 24

My attempt:

β_1=90.0 dB,β_2=92.0 dB

B2-B1= 10log(I1/I0)-10log(I2/I0)

=10log(I2/I0/I1/I0)

=10log(I2/I1)

0.2 =log(I2/I1)

Therefore: I2/I1=10^(0.2)= 1.58

32 machines/1.58 ≈20

The number of machines that must be removed is 32-20=12

Is that right?

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