Ncert Exercises & Solutions

8.5 A radio can tune in to any station in the 7.5 MHz to 12 MHz bands. What is the corresponding wavelength band?

Hint: $\lambda=\frac{c}{\nu} $
Step 1: Find the wavelength for minimum frequency.
The minimum frequency, $ν_{1} = 7.5 MHz = 7.5 \times 10^{6} Hz$
Speed of light, c =
The wavelength for minimum frequency,
$\lambda_{1}=\frac{\mathrm{c}}{\mathrm{\nu}_{1}}$

Step 2: Find the wavelength for maximum frequency.
$\lambda_{1}=\frac{\mathrm{c}}{\mathrm{\nu}_{2}}$

$= \frac{3 \times 10^{8}}{12 \times 10^{6}} = 25 m$

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