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Firdavs [7]
2 years ago
12

A construction explosion has an intensity I of 1.25 x 10–4 W/m2. Find the loudness of the sound in decibels if W/m2. Round to th

e nearest tenth.
A. 81 decibels
B. 161 decibels
C. 82.2 decibels
D. 12.5 decibels
Mathematics
2 answers:
bezimeni [28]2 years ago
7 0
We solve this problem by using the decibels formula which is expressed as:

dB = 10 x log (Isig/Iref)

where dB is decibels, Isig is the intensity of the signal and Iref is the intentsity of the softest sound the human ear can hear which has a value of 10^-12.

We solve as follows:
dB = 10 x log (<span>1.25 x 10–4 </span>/ 10^-12 ) = 80.97 decibels

Therefore, the correct answer is option A, 81 decibels.
damaskus [11]2 years ago
4 0

Answer:

Step-by-step explanation:

1. B) logb(q^2t^8)

2. D) None of these (it is actually log (x^4/(x+2)^6) :D)

3. B) log5(7)+5log5(a)

4. C) 6.209

5. A) 81 decibels

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Answer:

The answer is y = 2x - 3.

Step-by-step explanation:

Move 2x to the right side of the equation by adding it to both sides:

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y + 3 = 2x

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What is the quotient <br> 13632 divided by 48
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What is 66% of 75?<br> A. <br> 25<br> B. <br> 33<br> C. <br> 40<br> D. <br> 49.5<br> E. <br> 66
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How to Calculate Percentage in Excel using Formula?

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Percentage of Days spent in USA = 5 / 15 * 100 = 33.33%

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3 0
3 years ago
Read 2 more answers
PLS HELP
Gnesinka [82]

Answer:

9%

Step-by-step explanation:

Let the required number be 100.

Now, according to the question, the number is first increased by 30 %

⇒ 100 + 30 % of 100

⇒ 100 + [(30*100)/100]

⇒ 100 + 30

⇒ 130

Then, it is decreased by 30 %

⇒ 130 - (30 % of 130)

⇒ 130 - [(30*130)/100]

⇒ 130 - 39

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