The unit measurement for sound can be expressed in terms of intensity and in decibels. The intensity of sound is the measure of its power over unit area. The common unit of measurement is in decibels. This is commonly used in measuring the extent of noise. The conversion from intensity to the decibel unit is through logarithmic function. The formula is:
dB = 10 log(I/I0), where I0 is 10^-12 Watts per square meter
Substituting the values to the equation,
84 = 10log(I/10^-12)
I = 0.0002512 W/m2
In scientific notation the intensity is 2.512 x 10^-4 W/m^2.
A-11 polar easterlies
b-8 winds blowing between the equator and 30° N and south
c-10
d-9
Wind is caused by differences in the atmospheric pressure. When a difference in atmospheric pressure exists, air moves from the higher to the lower pressure area, resulting in winds of various speeds. On a rotating planet, air will also be deflected by the Coriolis effect, except exactly on the equator.
The density of the two pieces of rock is determined from the ratio of their masses to the pore volume of the rock.
<h3>What is density?</h3>
The density of an object is the ratio of mass to volume of the object.
Density = mass/volume
Assuming a constant pore volume of the rock = V
Density for 26.3 g = 26.3/V
Density for 58.3 g = 58.3g/V
Thus, the density of the two pieces of rock is determined from the ratio of their masses to the pore volume of the rock.
Learn more about density here: brainly.com/question/6838128
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