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8.Electromagnetic waves
easy
એક રેડિયો $7.5 \,M\,Hz$ થી $12\, M\,Hz$ ની વચ્ચે કોઈ રેડિયો સ્ટેશનને $Tune$ (સુમેળ) કરી શકે છે. આને અનુરૂપ તરંગલંબાઈનો ગાળો કેટલો હશે ?
Option A
Option B
Option C
Option D
Solution
A radio can tune to minimum frequency, $v_{1}=7.5 MHz =7.5 \times 10^{6} Hz$
Maximum frequency, $v_{2}=12 MHz =12 \times 10^{6} Hz$
Speed of light, $c=3 \times 10^{8} m / s$
Corresponding wavelength for $v_{1}$ can be calculated as:
$\lambda_{1}=\frac{c}{v_{1}}$
$=\frac{3 \times 10^{8}}{7.5 \times 10^{6}}=40 m$
Corresponding wavelength for $v_{2}$ can be calculated as
$\lambda_{2}=\frac{c}{v_{2}}$
$=\frac{3 \times 10^{8}}{12 \times 10^{6}}=25 m$
Thus, the wavelength band of the radio is $40 m$ to $25 m$.
Standard 12
Physics
