Question

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Answer 1

wavelength = c/frequency

here c = 3 × 10^8 m/s

wavelength = 3 × 10^8/1.6 × 10^8 × 10^3

= 1.875 × 10^-3 m

hope it helps..

Answer 2

✔✔Hee is your answer in the attachment ✔✔