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**help would be AMAZING!**

__ANY__Here's my questions...

"This question is about electromagnetic waves travelling in free space:

(a) Find the frequency of a wave where the wavelength = 1cm

(b) Find the wavelength of a wave with a frequency of 100 MHz

(c) Find the wavelength of a wave with a frequency of 300 MHz"

I assure you I have tried for HOURS to get my head around these I just can't and am desperate for some help!

Thank you SO much in advance!