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| Q. |
Radioactive elements emit – |
| A. | Radiowaves |
| B. | Infrared waves |
| C. | Ultraviolet waves |
| D. | α, β and γ radiations |
| Answer» D. α, β and γ radiations | |
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Explanation: The phenomenon of spontaneous emission of certain kinds of radiations by some elements is called radioactivity and the elements emitting such radiations are called radioactive elements. The nature of the radiations emitted from a radioactive substance was investigated by Rutherford in 1904 by applying electric and magnetic fields to the radiations. It is observed that on applying the field, the rays emitted from the radioactive substances are separated in to three types, called a, b and g rays. |
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