Describe how X-rays are used to locate cracks in fractured bones.
X-rays are used to locate cracks in the fractured bones because these can penetrate the flesh easily but are stopped by the bones which are quite hard. When X-rays are focussed on the fractured part of the body, then a clear image of the bones in that part of the body is formed on a photographic film placed behind the body part. The cracks in the bones can be seen clearly in the X-ray photograph.