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Question

Physics Question on communication systems

A radio can tune to any station in 7.5MHz7.5\, MHz to 12MHz12\, MHz band. The corresponding wavelength band is

A

25m40m25\, m - 40\, m

B

10m30m10\, m - 30\, m

C

2040m20 - 40\, m

D

25m35m25 \,m - 35\, m

Answer

25m40m25\, m - 40\, m

Explanation

Solution

Wavelength corresponding to 7.5MHz7.5\, MHz frequency λ1=cυ=3×1087.5×106=40m \lambda_{1} = \frac{c}{\upsilon} = \frac{3\,\times\,10^{8}}{7.5\,\times\,10^{6}} = 40\,m Wavelength corresponding to 12MHz12 \,MHz frequency λ2=3×10812×106=25m\lambda _{2} = \frac{3\,\times\,10^{8}}{12\,\times\,10^{6}} = 25\,m Corresponding to the given frequency bands, the wavelength band is 25m40m25 \,m - 40 \,m.