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Very high frequency waves and carry a lot of energy. They will pass through most substances. This makes them useful in medicine.

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Wavelength: 10-10

Frequency:10¹⁸

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Airports use x-rays  like  airport security to see inside the luggage .

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Astronomers also use x-rays many objects in the universe emit x-rays which can detect using suitable radio telescopes .

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Doctors use x-rays to see inside people.