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X-rays are very high frequency waves, and carry a lot of energy. They will pass through most substances, and this makes them useful in medicine and industry to see inside things.

X-rays are given off by stars, and strongly by some types of nebula.

An X-ray machine works by firing a beam of electrons at a "target". If
we fire the electrons with enough energy, X-rays will be produced.

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-Higher frequency (10^18) and Shorter wavelengths (10^-10)

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How are X-Ray waves used in the medical field?

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X-Rays can show bones without operation to show if any fractures or breaks.
X-Rays can penetrate dense materials such as skin and tissue but not bone.

X-Rays are also used in space which can detect using suitable radio telescopes.

X-Rays are also used in airports to check our bags for weapons.

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X-Ray waves can cause cell damage and cancer. This is why, when using it medically, doctors and dentists MUST use a shield.