Question

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) None of these

Answer 1

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