4. You need an X-ray during a hospital visit and are asked to stand in front of a machine which will fire X-rays at you, while the operator of the machine will hide behind a protective barrier or shield. (a) Explain clearly why the operator needs to be shielded, even though you are being hit[2 marks]with X-rays without any apparent ill-effects? (b) The doctor tells you that the X-rays are a form of radiation. Are they correct? Clearly[1 mark]justify your answer.

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