For highest frequency, wavelength should be smallest as wavelength and frequency are inversely related.
Option 1:
Wavelength = 14 mm
= 1.4*10^-2 m
Option 2:
Wavelength = 14 nm
= 1.4*10^-8 m
Option 3:
Wavelength = 8 mm
= 8*10^-3 m
Option 4:
Wavelength = 8 nm
= 8*10^-9 m
Clearly wavelength is smallest for option 4
So, frequency is highest in this case
Answer: option 4
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