Verified Answer :

As we know that
speed of an EM wave is 3x10^8 
And also
Velocity =Frequency x Wavelength 
so for wavelenht
Wavelength = Velocity/ Frequency 
so
wavelength = 3 x 10^8 / 5 x 10^9 
= 3/50 or 0.06m
hope it helps

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