13. how is 0.00069 written in scientific notation?
a. 69 x 10–5
b. 6.9 x 104
c. 0.69 x 10–3
d. 6.9 x 10–4

The correct answer to the question is

EXPLANATION:

The magnitude of measurement of any physical quantity in scientific notation is expressed as follows-

                          Magnitude = .

Considering the numerical part only, magnitude m = .

Here, p ∈ Q, and 1 ≤ p ≤ 9.

Here, n is called the power or index of ten.

As per the question, we have m = 0.00069.

In proper scientific notation, the value is written as -

                                              m = 0.00069

                                                  =           [ans]

Hence, 0.00069 can be written as in scientific notation.

answer: option c.

explanation: