A radio can tune to any station in the 7. 5 MHz to 12 MHz band. What is the corresponding wave length band ?
(A) 400m – 250m
(B) 40m – 25m
(C) 4m – 2.5m
(D) of these
The correct option is (B) 40m – 25m.
Explanation:
c = f × λ
hence λ = (c/f)
∴ wave length band is [c / (7.5MHz)] to [c / (12MHz)]
∴ band is [(3 × 108) / (7.5 × 106)] to [(3 × 108) / (12 × 106)]
i.e. 40m to 25m
