Textbook 1A #7

[Jayza Calderon 2A]

When converting from frequency to wavelength I am asked for it in nanometers. In part A of the problem I get 4.22 * 10^-7 m which is 422nm and is the correct answer according to the textbook. For part b I got 1.5 * 10^-10 m which I thought would be 150 nm and according to the textbook is also correct. My confusion/question has to do with the units. Does the exponent of the 10 not matter when converting from meters to nanometers?

[Sahir Eusuff 2H]

I believe part B asks for us to use picometers as the unit, which would give us an answer of 150 pm. I think the textbook might have accidentally had nm instead of pm for the answer.

[Jayza Calderon 2A]

Okay, that makes sense! So would the unit for picometers be an exponent of -10, because that is what I got. But when I googled it said -12.