The radioisotope that will have a larger amount left after 5 hours has elapsed is Radioisotope B
Half-life is simply defined as the time taken for half the original amount to decay. This implies that the longer the half-life, the more stable the material will be.
The half-life of a material also indicates how long a material will last before it will finally decay to zero level. This means that materials with a longer half-life decays slower than those with shorter half-life.
Considering the question given above,
radioisotope A has a half-life of 2 minutes while radioisotope B has a half-life of 2 hours.
From the explanation made above we, can conclude that radioisotope B will be larger than A after 5 hours because radioisotope B has a longer half-life than radioisotope A.
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