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X-rays can be used

for cutting and welding of metals.

to detect heart diseases.

to detect defects in precious stones and diamonds.

to detect gold under the earth.

Answer : Option C

Explanation :

X-rays are used to detect and photograph defects of internal structure of a body such as metals, machine parts, cracks in wood, defects in diamonds and other precious stones, etc. They can reveal inhomogeneities—such as inclusions, lattice defects, etc in gems and stones.