Dysprosium-154 has a half-life of 3.0 million years for its alpha decay into gadolinium-150. A sample of pure dysprosium-154 has decayed so that it has 1.0 grams of dysprosium-154 and 15.0 grams of gadolinium-150. For how much time has this decay been happening? * 3.0 million years

6.0 million years

12.0 million years

16.0 million years

where is the circuit diagram ?

answer: at 24 february, 2014 the population gets twice of its initial population.

explanation:

since we have given that

the population for alpha city, t years after january 1, 2004 is given as

first we find out the initial population, i.e. t=0,

so, our quadratic equation becomes,

according to question, we have said that if the population has twice its initial population, then it becomes

so, time taken to reach this above mentioned population is given by

now, we know that time can't be negative so, we take t=9.149 years.

hence, at 24 february, 2014 the population gets twice of its initial population.

c) up

hope this

the force represented by vector a is normal force. if the hockey puck is moving to the right, when it is hit with a significant force by the hockey stick the puck will move off in a different direction. correct on edge.