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ICSE Class 10 Physics Question 19 of 20

Solved 2018 Question Paper ICSE Class 10 Physics — Question 17

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Question 10(b)

The ore of Uranium found in nature contains 92238U_{92}^{238}\text{U} and 92235U_{92}^{235}\text{U}. Although both the isotopes are fissionable, it is found out experimentally that one of the two isotopes is more easily fissionable. [3]

(i) Name the isotope of Uranium which is easily fissionable.

(ii) Give a reason for your answer.

(iii) Write a nuclear reaction when Uranium 238 emits an alpha particle to form a Thorium (Th) nucleus.

Answer

(i) 92235U_{92}^{235}\text{U} is easily fissionable.

(ii) The reason is that the fission of 92238U_{92}^{238}\text{U} nucleus is possible only by the fast neutrons, while the fission of 92235U_{92}^{235}\text{U} nucleus can be done by both slow as well as fast neutrons.

(iii) 92238U_{92}^{238}\text{U} ⟶ 90234Th_{90}^{234}\text{Th} + 24He_{2}^{4}\text{He}