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7.The mass of a grain of sand is approximately 2.8×10^−11 grams

Select from the drop-down menu to correctly complete the statement.
The mass of a grain of sand is approximately 2.8×10^−8

Answer Choices:
A. Milligram
B.Gram
C.Killogram
Explain rightnoww

Respuesta :

MattTheHooper
The Answer is A. Milligram.
JeanaShupp

Answer :- A) Milligram is the right answer.


Explanation:-

The mass of a grain of sand is approximately [tex]2..8\times10^{-11}\text{ grams}[/tex]

We know that 1 gram=1,000 milligrams

Therefore,The mass of a grain of sand is approximately  [tex]=2.8\times10^{-11}\times1000\text{ milligram}\\=2.8\times10^{-11}\times10^3\text {milligram}\\=2.8\times10^{-11+3}\text{ milligram}....\text{[by using law of exponents]}\\=2.8\times10^{-8}\text{ milligram}[/tex]

Thus, the  mass of a grain of sand is approximately [tex]2.8\times10^{-8}\text{ milligram}.[/tex]

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