Q137 / 160 · AP EAMCET 2020 (21 Sep Shift 1) · Physics

If a source is transmitting electromagnetic wave of frequency \(8.2 \times 10^6 \mathrm{~Hz}\), then wavelength of the electromagnetic waves transmitted from the source will be

  • Correct answer
    A
    \(36.5 \mathrm{~m}\)
  • B
    \(40.5 \mathrm{~m}\)
  • C
    \(42.3 \mathrm{~m}\)
  • D
    \(50.9 \mathrm{~m}\)

Solution

Frequency of electromagnetic wave, \(v=8.2 \times 10^6 \mathrm{~Hz}\) Wavelength, \(\lambda=\) ? We know that, velocity of electromagnetic wave is given as \(\begin{aligned} c & =\mathrm{v} \lambda \Rightarrow \lambda=\frac{c}{\mathrm{v}} \\ & =\frac{3 \times 10^8}{8.2 \times 10^6}=36.5 \mathrm{~m} \end{aligned}\)

Hence, the correct answer is option: 'A'.

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