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(B) Wilhelm Roentgen,a Professor of Physics in Wurzburg,Bavaria,discovered $X$-rays in $1895$ accidentally while testing whether cathode rays could pa

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$X$-rays

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(B) Wilhelm Roentgen,a Professor of Physics in Wurzburg,Bavaria,discovered $X$-rays in $1895$ accidentally while testing whether cathode rays could pass through glass.$X$-rays are electromagnetic radiation of extremely short wavelength and high frequency,with wavelengths ranging from about $10^{-8} \ m$ to $10^{-12} \ m$ and corresponding frequencies from about $10^{16} \ Hz$ to $10^{20} \ Hz$.

$W$. $K$. Roentgen discovered

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