Costume of the lower orders of London by Thomas Lord Busby

By Thomas Lord Busby

Костюмы жителе низших слоёв общества Лондона

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The matter A is supplied at a constant rate from a primary source. Required to find the number of particles of A, B, C at any subsequent time t, when initially A, B, G are absent. The solution can be simply obtained in the following way. Suppose that the conditions of Case 2 are fulfilled. The products A, B, C are in radioactive equilibrium and let P o , Qo, Ro be the number of particles of each present. Suppose the source is removed. The values of P, Q, R at any subsequent time are given by equations (10), (11) and (12) respectively.

For example, the j8 rays from radium consist of negatively charged particles projected with a wide range of velocity, and, in consequence, they are absorbed in different amounts in passing through a definite thickness of matter. In each case, only a fraction of the energy absorbed is transformed into the particular type of energy, whether ionic, chemical, or luminous, which serves as a means of measurement. § 10 b. The a rays. After the discovery of radioactivity, attention was at first directed to the /3 rays on account of their great penetrating power and their marked action on a photographic plate, and in producing phosphorescence in certain substances.

The a rays. After the discovery of radioactivity, attention was at first directed to the /3 rays on account of their great penetrating power and their marked action on a photographic plate, and in producing phosphorescence in certain substances. Towards the end of 1899, at an early stage in the history of radioactivity, the /? rays were found to be easily deflected by a magnetic field, and it was correctly concluded that the j8 rays consisted of a stream of negatively charged electrons projected at high speeds from the radioactive matter.

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