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ICSE Class 10 Physics Question 22 of 27

Solved Sample Paper 5 — Question 11

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Question

Question 7(ii)

(a) After emission of an α-particle and two β-particles from an element 92P238, we get another element bRa. What is the relation between P and R ?

(b) Name the radiation which is used in carbon dating.

Answer

(a) 92238P⟶α 90234Q⟶2β 92234R^{238}_{92}\text{P} \overset{\alpha} \longrightarrow \space ^{234}_{90}\text{Q} \overset{2\beta} \longrightarrow \space ^{234}_{92}\text{R}

As P and R have same atomic number and different mass number hence they are called isotopes.

(c) β radiation is used in carbon dating.