Question

HELP I NEED THIS DONE ASAP

The wavelength of violet light in a spectrum is about 0.0000004 meters. Which number best approximates this length as a power of 10? O A. 4x 10-6 O B. 4 x 10-7 O C. 4x 107 O D. -4x 107​

Answer 1

4 x 10^-7

hope this is it

Answer 2

B

Explanation:

You need to move the decimal 7 places to the right