a
અહી, \(\,{\text{c  =  3 }} \times {\text{ 1}}{{\text{0}}^{\text{8}}}{\text{ m }}{{\text{s}}^{{\text{ - 1}}}}{\text{ }}{\mathbf{f }}{\text{ =  8}}{\text{.2 }} \times {\text{ 1}}{{\text{0}}^{\text{6}}}{\text{ Hz }}\)

હવે, \(\lambda \,\, = \,\,\frac{c}{{f}}\,\, = \,\,\frac{{3\, \times \,\,{{10}^8}}}{{8.2\, \times \,{{10}^6}}}\,\, = \,\,\frac{{300}}{{8.2}}\,\,\, = \,\,36.\,6\,\,m\)