|Class 12 Physics Electromagnetic Waves||Electromagnetic Spectrum|
The electromagnetic spectrum, with common names for variouspart of it. The various regions do not have sharply defined boundaries.
Problem:- A radio can tune in to any station in the 7.5 MHz to 12 MHz band. What is the corresponding wavelength band?
Answer:- A radio can tune to minimum frequency, ν1 = 7.5 MHz= 7.5 × 106 Hz
Maximum frequency, ν2 = 12 MHz = 12 × 106 Hz
Speed of light, c = 3 × 108 m/s
Corresponding wavelength for ν1 can be calculated as:
λ1 = (c/v1) = (3x108)/ (7.5x106) = 40m
Corresponding wavelength for ν2 can be calculated as:
λ2 = (c/v2) =(3x108)/ (12x106) =25m
Thus, the wavelength band of the radio is 40 m to 25 m.