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  4. Sulphur-35 (34.96903 amu) emits a P-particle but no γ - ray. The product is chlorine-35 (34.96885 amu). The maximum energy of the β - particle emitted is :

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Q. Sulphur-35 (34.96903 amu) emits a P-particle but no $ \gamma - $ ray. The product is chlorine-35 (34.96885 amu). The maximum energy of the $ \beta - $ particle emitted is :

EAMCETEAMCET 1996

Solution:

Energy can be calculated by calculating the value of mass defect. $ \Delta m=34.96903-34.96885 $ $ =0.00018\,\text{amu}\text{.} $ Maximum energy $ dE=\Delta m\times 931.5\,\text{Me}\,\text{V} $ $ =0.00018\times 931.5 $ $ =0.16758\,\text{MeV} $