Question

There are 86,400 seconds in a day. How many days long is a second? Express your answer in scientific notation upto 3 decimal places.

• A. $1.157\times {10}^{-6}$
• B. $1.234\times {10}^{-5}$
• C. $1.157\times {10}^{-5}$
• D. $1.432\times {10}^{-4}$

Answer 1

The correct option is C $1.157\times {10}^{-5}$

1 day = 86400 sec
So, 86400 s = 1 day
So, 1 s = $\frac{1}{86400}$ days
So, 1 s = 0.00001157.. days
So, 1 s = 1.157 $\times$ ${10}^{-5}$ days