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Q. A radio can tune to any station in $7.5\, MHz$ to $12\, MHz$ band. The corresponding wavelength band is

Electromagnetic Waves

Solution:

Here, $\upsilon_{1} = 7.5 \,MHz$, $\upsilon_{2} = 12\, MHz$
$\therefore \quad\lambda_{1} = \frac{c}{\upsilon_{1}} = \frac{3 \times 10^{8}}{7.5 \times 10^{6}} = 40 \,m$
and $\lambda _{2} = \frac{c}{\upsilon _{2}} = \frac{3 \times 10^{8}}{12\times 10^{6}} = 25\, m$