Question: I need an answer for these two question as soon as possible please, thanks. all details are provided (1 point) An unknown radioactive element decays

I need an answer for these two question as soon as possible please, thanks. all details are provided

please, thanks. all details are provided (1 point) An unknown radioactive element

(1 point) An unknown radioactive element decays Into non-radioactive substances. In 780 days the radioactivity of a sample decreases by 57 percent. (a) What Is the half-life of the element? half-life: (days) (b) How long will it take fora sample of 100 mg to decay 1:0 43 mg? time needed: (days) When a hot object is placed in a water bath wl'nee temperature is 25C, It cools from 100C to 50C in 1955. In another bath, the same doolirg occurs In 1753. Find the temperature of the second bath. The temperature of u second bath = C] \"C

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