Answer:
The decibel level of this second sound is 48.021 decibels.
Step-by-step explanation:
The acoustic intensity (), measured in decibels, is defined by the following formula:
(1)
Where:
- Reference sound intensity, measured in watts per square meter.
- Real sound intensity, measured in watts per square meter.
If we know that and , then the real sound intensity of the first sound is:
The real sound intensity of the second sound is four times greater, that is:
If we know that and , then the acoustic intensity of the second sound is:
The decibel level of this second sound is 48.021 decibels.
Answer:
b
Step-by-step explanation:
it might be wrong tho-
Answer: 8 times.
Step-by-step explanation:
I will answer in English:
This says:
The volume of a cube is 125cm^3
How many times the volume will increase if we duplicate the lenght of the side?
If L is the lenght of the side, we have that the volume of the cube is:
V = L^3
If we duplicate the lenght of the side, the new volume is:
V = (2*L)^3 = 8*L^3
So we can see that the volume of the new cube is 8 times the volume of the previous cube.
Now, we can do the math, for our original cube we have:
L^3 = 125cm^3
L = 5cm
the new cube has L' = 2*L = 10cm
The volume of this cube is:
V' = L'^3 = 10cm^3 = 1000cm^3
the ratio V'/V is:
1000cm^3/125cm^3 = 8
Answer:
$17.60
Step-by-step explanation:
We know that Emma spent $16.00 on her food.
There is a 10% tax.
Therefore, the total bill will be the price <em>without tax</em> plus the <em>tax</em>.
The price without tax is $16.00.
Tax is 10%. So, the tax will be 10% of 16.
10% of 16 is the same as 0.1(16) or 1.6.
So, the tax is $1.60.
Therefore, the total bill is:
$16.00+$1.60=$17.60.
Emma’s total bill comes to $17.60