When X-rays are incident on an object in a da | vedclass

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(A) $X$-rays are electromagnetic waves with wavelengths in the range of $0.01 \ nm$ to $10 \ nm$. Human eyes are only sensitive to the visible spectru

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Invisible

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(A) $X$-rays are electromagnetic waves with wavelengths in the range of $0.01 \ nm$ to $10 \ nm$. Human eyes are only sensitive to the visible spectrum,which ranges approximately from $380 \ nm$ to $750 \ nm$. Since the wavelength of $X$-rays is much shorter than the visible spectrum,they cannot be detected by the human eye. Therefore,$X$-rays are invisible to the human eye.

When $X$-rays are incident on an object in a dark room,they will appear as ........

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