Write the Number in Scientific Notation $7.3 \times 10 ^ { 3 }$

Multiple Choice

Write the number in scientific notation. 0.0073

A) $7.3 \times 10 ^ { 3 }$
B) $7.3 \times 10 ^ { - 2 }$
C) $7.3 \times 10 ^ { 4 }$
D) $7.3 \times 10 ^ { - 3 }$
E) $7.3 \times 10 ^ { - 4 }$