In scientific notation, 0.00074m can be written as 1- 0.74×10‐³m 2- 7.4×10-⁴m 3- 74×10‐⁵m 4- 740×10‐⁶m

Explanation:

Given

Required

Express as scientific notation

The scientific notation of a number is:

Where

This implies that:

Next, is to determine the value of b.

Count the number of point to move from the current point location to 7.4.

If the point moves backward, b will be negative, else b will be positive.

So:

Hence:

beta is electron from nucleus

something from nucleus has changed, but charge must be same for cons of charge