In 1895, a german physicist named wilhelm roentgen was conducting experiments with vacuum tubes, which he kept completely closed off from light, when he noticed that some sort of radiation was escaping the apparatus. he eventually realized that his vacuum tubes could produce radiation that was able to pass through many different objects including human tissues. he used this unknown type of radiation to produce a picture of his wife's hand.

this discovery eventually let to
a.
the use of radioactive material to produce electricity in the form of nuclear power.

b.
the use of radioactive material to produce powerful weaponry.

c.
the use of x-ray machines to create images of the body's internal structure.

d.
the use of vaccines to limit the virulence of numerous viral diseases.