The electric charge on an electron is 0.00000000000000000025 coulomb. Write this number in scientific notation.
A) $2.5 \times 10 ^ { - 19 }$ coulomb
B) $2.5 \times 10 ^ { - 18 }$ coulomb
C) $25 \times 10 ^ { - 20 }$ coulomb
D) $0.25 \times 10 ^ { - 18 }$ coulomb
E) $2.5 \times 10 ^ { - 20 }$ coulomb

Question

Quizplus · Accepted Answer

To convert the given number to scientific notation, we need to move the decimal point to the left until only one digit remains to the left of the decimal point. We count the number of places we moved the decimal point and use this as the power of 10. In this case, we need to move the decimal point 19 places to obtain:

0.00000000000000000025 = 2.5 × 10^-19

Therefore, the correct answer is A.

The Electric Charge on an Electron Is 0 2.5×10−192.5 \times 10 ^ { - 19 }2.5×10−19

The Electric Charge on an Electron Is 0 $2.5 \times 10 ^ { - 19 }$