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| Q. |
Winch of the following is not true about X-rays? |
| A. | have low penetrating power |
| B. | travel with the speed of light |
| C. | Can be reflected or refracted |
| D. | can affect photographic plates |
| Answer» A. have low penetrating power | |
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Explanation: X-rays and gamma rays are photons, i.e. high-energy light-waves. When emitted by a source, for example, radium or cobalt, located outside the body, they easily pass through the body, hence they are usually called penetrating radiation. Because X-rays are penetrating, they can be used in diagnostic medicine to image human bones or human organs made opaque by a dye. |
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