A mixture is not a pure substance
Answer:
The number of electrons passes through the circuit if it detects a signal which persists for 1.0 microseconds is
.
Explanation:
A circuit in a radio receiver requires a current of at least 1.0 microamp in order to detect a signal. It is required to find the number of electrons passing through the circuit if it detects a signal which persists for 1.0 microseconds.
It is known that the total amount of charge passing through a circuit is calculated as, Q=It.
Where I is the amount of current passing through a time of t.
For this problem, I=1.0 microamp, and t=1.0 microseconds. Therefore the amount of charge is,

The amount of charge in one electron is
, therefore the number of electrons passing through the circuit while carrying
amount of charge is,

To know more about the number of electrons passing through the circuit, refer to:
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1.)the microwaves are absorbed by the water molecules in the cocoa. this causes the water molecules to vibrate very fast.
2.)this fast vibration causes the molecules to heat themselves up by means of bumping into each other (friction).
Density is mass over volume. Density is also a charecteristic property wich defines a substance and two different substance cant have the same charasteristic property.
Distillation, for the water to be seperated it must be heated to break the chemical bond.