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physics noob

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given EM travelling west, B field oscilates vertically and has f= 80,000 Hz and a rms strength of 6.75e-9 T what are the frequency and rms strength of electric field and what direction...

so for direction i have it ocscillating horizontally and for rms strength i have E= cB

so E = 2 v/m but for frequency i have no idea

wavelength * f = v but i have no idea what wavelength is.... any help is appreciated thanks!