A synthetic radioactive element decays at a rate proportional to its mass ....

A synthetic radioactive element decays at a rate proportional to its mass.

(a) write down a differential equation to represent this situation.

(b) If 30% of the element has decayed after 24 hours, what percentage is left after 48 hours?

c) How long does it take for 90% of the element to decay?

(Thinking)

Re: Help me with this qeustion, please

One for free:

Mass as a function of time: m(t)

Decay Rate of Element: dm/dt

Go!

Re: Help me with this qeustion, please

Quote:

Originally Posted by

**TKHunny** One for free:

Mass as a function of time: m(t)

Decay Rate of Element: dm/dt

Go!

And because I'm so nice, one for free from me too :P

If a is proportional to b, then a = kb, where k is some constant.