Question

the calculator screen shows the approximate wavelength, in millimeters, of cyan light. 5e - 4 progress: 0/2 part 1 of 2 (a) write the number shown on the screen in scientific notation.

Explanation:

Step1: Understand scientific - notation format

Scientific notation is of the form $a\times10^{n}$, where $1\leq|a|\lt10$ and $n$ is an integer. The "E - 4" on the calculator screen means $\times10^{- 4}$.

Step2: Identify the coefficient and exponent

The number on the calculator screen "5E - 4" means $5\times10^{-4}$.

Answer:

$5\times10^{-4}$