Mass of water= 67.5g
∆T = 98.5C0 – 25C0 = 73.5C0
Change in energy (∆Q)=?
∆Q = mC∆T
= (67.5) (4.186)
since you haven't provided complete question, i am giving you the general information for Cs-137. if you need more you can ask.
*it's isotope mass is 136.9070 u
*it's half-life is 30.17 years
* it is easily soluble in water, so there is a high risk of it's poisoning.
* it is used in medicine (radiation therapy), industries (calibrate radiation-detection equipment) and in other fields.
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