Igcse Model Questions Vol1 2019 Physics Question 11
Practice objective / multiple choice question 11 from the 2019 Igcse Model Questions Vol1 Physics examination.
A 2.0 g sample of a radioactive isotope X (atomic mass 240 g·mol\(^{-1}\)) undergoes alpha decay releasing 5 MeV of energy per decay. The sample is placed in 1.0 kg of water (specific heat capacity 4180 J·kg\(^{-1}\)·K\(^{-1}\)). After 10 minutes the temperature of the water has risen by 0.5 °C. Assuming all the released energy is absorbed by the water, calculate the half‑life of isotope X. Give your answer in years (to two significant figures).
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About This Question
This is Igcse Model Questions Vol1 2019 Physics Question 11. It is one of the objective questions from the 2019 Igcse Model Questions Vol1 Physics examination.
Difficulty level: Hard .
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