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How many decays per second is in a curie?
Curie: A unit of radioactivity equal to 3.7 � 10^10 Disintegrations (decays) per second.
After 7 minutes a 53 g sample of plutonium decays to 36 g how long will it take for the sample to decay to 13 of its original amount?
It will take 25.0898 minutes, approx.
A sample of an unknown radioisotope exhibits 8540 decays per second After 350 minutes the number of decays has decreased to 1250 per second What is the half life?
The decay rate N at time t is N(t)=N(0) x 2^-(t/t_half), where t_half is the half life and N(0) is the decay rate at t=0. The ^ means "to the power of."You can solve this for t_half:t_half = - t / log_2(N(t)/N(0)) (log_2 means logarithm base 2)N(350 minutes)=1250, N(0)=8540. The rest is just finding a calculator to give you log_2 of 1250/8540.
Is it possible for a function that has a horizontal asymptote to attain the value of an asymptote?
Yes. Think of a function that starts at the origin, increases rapidly at first and then decays gradually to an asymptotic value of 0. It will have attained its asymptotic value at the start. For example, the Fisher F distribution, which is often used, in statistics, to test the significance of regression coefficients. Follow the link for more on the F distribution.
How many Becquerel equals a milligram?
There can be no equivalenece. A becquerel is the SI derived unit of radioactivity. It is defined as the activity of a quantity of radioactive material in which one nucleus decays per second. It is a measure in inverse second, s-1 and so has dimensions [T-1]. A milligram is a measure of mass, whose dimension is [M]. The two have different dimensions and according to basic principles of dimensional analysis, conversion from one to the other is not valid.
