Light Frequency Problem, need help?

Question

Two part question i need both parts, i have trouble converting it to nm, can someone help.

part

Light with a frequency of 6.97 × 1014 Hz lies

in the violet region of the visible spectrum.

What is the wavelength of this frequency of

light? Answer in units of nm.

part 2

When an electron beam strikes a block of

copper, x-rays of frequency 1.18 × 1019 Hz

are emitted. What is the wavelength of these

x-rays? Answer in units of pm.

Answer 1

part 1  wavelength = c/frequency

3*10^8/6.97*10^14=4.3*10^-7m=430 nm is violet

part 2  same formula

3*10^8/1.18*10^19=2.543*10^-11m=25.43pm=...

.