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| the time required for one half the atoms of a given amount of a radioactive substance to disintegrate |
| a longitudinal wave in an elastic medium, especially a wave producing an audible sensation |
| radius of gyration | |
| —n | |
| a length that represents the distance in a rotating system between the point about which it is rotating and the point to or from which a transfer of energy has the maximum effect. Symbol: k or r. In a system with a moment of inertia I and mass m, k² = I/m | |