Seudónimo Seudónimo

03-07-2017
Mathematics

contestada

a 9 gram sample of a substance that's used for drug research has a k-value of 0.1459

Respuesta :

Аноним Аноним

09-07-2017

N = N0 e^(-kt)

for half life N/N0 = 1/2 and k = 0.1459

1/2 = e^(-0.1459t)

=> -0.1459 t = ln(0.5)

t = - ln(0.5) /0.1459

= 4.8 days

Answer Link

Otras preguntas

Gianina wanted to buy new bike. She saw that it was regularly priced at $400 but it was on clearance for $300. What is the percent of decrease? a. 100% b. 25% c

Spanish question plzzz help thanks

Select all that apply. Select the four items that best describe the colony of North Carolina: rice, indigo O Virginia frontiersmen, Quakers, German farmers work

Identify which line from the graph the following right triangles could lie on

what did churchill mean when he describe russia as being "a riddle wrapped in a mystery inside an enigma?"

help me please!!! anything will help.

Which cells in your body undergo cellular respiration? Select one: a. your brain cells b. your skin cells c. your heart cells d. every cell in your body

Please help me figure this out! God bless you <3

A man is standing next to a 24 foot tree. the man is 7 feet tall with a shadow of 3 feet. how long is the shadow of the tree

An car has an acceleration of 8.0 m/s/s. How much time is needed to reach a velocity of 30 m/s from rest? please help !!