- Xenon-135 (a fission product in nuclear fuel) has a half-life of 9.10 hours. I

Question

- Xenon-135 (a fission product in nuclear fuel) has a half-life of 9.10 hours. It experiences beta decay to form Cesium-135. If there are known to be 1010 Xe-135 nuclei present at time t=0, how many nuclei will be left after 24 hours?
- Iodine-135 has a half-life for B- decay of 6.585 hours. 1-Determine the decay constant for I-135 2-if a sample contains 2x10-2 g of I-135, how many grams of I-135 will remain undecayed after 45 hours - Xenon-135 (a fission product in nuclear fuel) has a half-life of 9.10 hours. It experiences beta decay to form Cesium-135. If there are known to be 1010 Xe-135 nuclei present at time t=0, how many nuclei will be left after 24 hours?
- Iodine-135 has a half-life for B- decay of 6.585 hours. 1-Determine the decay constant for I-135 2-if a sample contains 2x10-2 g of I-135, how many grams of I-135 will remain undecayed after 45 hours
- Iodine-135 has a half-life for B- decay of 6.585 hours. 1-Determine the decay constant for I-135 2-if a sample contains 2x10-2 g of I-135, how many grams of I-135 will remain undecayed after 45 hours

Explanation / Answer

Ans 1 :

USing half life formula :

Nt = No (1/2) t / t 0.5

where Nt = amount of sample left

No = initial amount of sample

t = amount of time lapsed

t 0.5 = half life

So putting all the values we get :

Nt = 1010 (1/2)24 / 9.10

Nt = 162

So 162 nuclei will be left after 24 hours

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