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(C) The electromagnetic spectrum is ordered by wavelength and frequency. Gamma rays have the highest frequency and the shortest wavelength in the elec

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${\lambda _1} > {\lambda _2}$

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(C) The electromagnetic spectrum is ordered by wavelength and frequency. Gamma rays have the highest frequency and the shortest wavelength in the electromagnetic spectrum.$X$-rays have a longer wavelength compared to gamma rays but a shorter wavelength than ultraviolet rays.Therefore,the wavelength of $X$-rays $({\lambda _1})$ is greater than the wavelength of gamma rays $({\lambda _2})$.Thus,the correct relation is ${\lambda _1} > {\lambda _2}$.

If ${\lambda _1}$ and ${\lambda _2}$ are the wavelengths of characteristic $X$-rays and gamma rays respectively,then the relation between them is

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