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A radio can tune to any station in the frequency range from 2.5 MHz to 15 MHz bands. What is the corresponding wavelength band?(a) 30 m to 130 m(b) 40 m to 140 m(c) 20 m to 120 m(d) 10 m to 110 mThe question was posed to me in quiz.The doubt is from Electromagnetic Spectrum in division Electromagnetic Waves of Physics – Class 12

Answer»

The correct ANSWER is (c) 20 m to 120 m

Easy explanation: Maximum wavelength in the band will correspond to the LOWEST frequency:

c=fminλmax

λmax=\(\frac {c}{f_{min}}=\frac {3\times 10^8}{2.5\times 10^6}\)=120 m

Minimum wavelength in the band will correspond to the HIGHEST frequency:

c=fmaxλmin

λmin=\(\frac {c}{f_{max}} =\frac {3\times 10^8}{15 \times 10^6 }\)=20 m

Therefore, the CORRESPONDING wavelength band is 20 m to 120 m.


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