Question

A possible wavelength for the color blue is 0.000000492 meter. Which of the following is a reasonable estimate for this wavelength for the color blue?
A. 5 × 10-6 m
B. 5 × 107 m
C. 5 × 10-7 m
D. 5 × 106 m

Answer 1

The answer is B. 5 x 107 m. I did the test.

Answer 2

For this case we must find a reasonable estimate, in scientific notation, for a wavelength given by:

0.000000492 meters

If we roll the decimal seven spaces to the right we have:

$4.92 * 10 ^ {- 7}\ m$

The exponent is negative.

The expression can be written as:

$5 * 10 ^ {- 7}\ m$

Answer:

Option C