angelinaskerrit6328 angelinaskerrit6328

25-12-2017
Mathematics

contestada

The decay rate for a radioactive isotope is 9.29.2 percent per year. find the half-life of the isotope. round to the nearest tenth of a year.

Respuesta :

mathstudent55 mathstudent55

25-12-2017

Exponential decay is given by the equation

F = P(1 - r)^t

0.5 = 1(1 - 0.092)^t

0.5 = (0.908)^t

log 0.5 = log (0.908)^t

log 0.5 = t * log 0.908

t = (log 0.5)/(log 0.908)

t = 7.18

Answer: 7.2 years

Answer Link

Otras preguntas

A male rabbit has white hair; a female has brown hair. What do you think the most likey color of their offspring is?

Substitution methode: y=2x-5 4x-y=7 I thought you do it like this: 4x-2x-5=7 2x-5=7 2x=12 x=6 But that's not right.. What did I do wrong?

What is integrate suffix?

Is the reaction rate always positive? why or why not?

write the standard form of 6.45 billion?

order from least to greatest 5.04,5.4,5.406,5.064

I NEED HELP PLEASE! Jenny's birthday cake is circular and has a 30 cm radius. Her slice creates an arc of with a central angle of 120 degrees. What is the area

Name a substance that moves by each mechanism

The greatest common factor of 18 and a mystery number is 6. Give three possible values for the mystery number.

How did trade affect Sumerian sociaty?