Question

A sample of silicon rejected for use in an electronic circuit has an impurity of boron at a level of 3 parts per trillion. What is the fraction of boron atoms in the silicon sample as written in scientific notation? In equation form 3 parts per trillion is written as 3/10^12 A) 3 x 10-12 B) 3 x 106 C) 3×10-9 D) 3 x 109

Answer 1

Step-by-step explanation:

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Answer 2

A. 3 x 10-12

Step-by-step explanation:

Generally, the parts-per notation is used to represent very small concentration without any specific unit.

Parts per million is notated as
`10^(-6)`

Parts per billion is notated as
`10^(-9)`

Parts per trillion is notated as
`10^(-12)`

Hence, 3 parts per trillion will be written as 3 x
`10^(-12)`

The correct option is A.