Question

Size of a bacteria is $1.5\times {10}^{-7}m$. This number can also be written as:

• A. $0.00000015$
• B. $0.0000015$
• C. $0.000000015$
• D. $15000000$

Answer 1

Answer: (A)

$0.00000015$

$a\times {10}^{-k}=\frac{a}{{10}^k}$

$1.5\times {10}^{-7}=\frac{1.5}{{10}^7}=0.00000015$