The time it takes for 1g of strontium-90 to decay to 250 mg is; 57.6 years
<h3>What is the half life of an element?</h3>
The formula for half life is;
A(t) = A₀ * (¹/₂)^(t/t_1/2)
Where;
A(t) is amount left after t years
A₀ the initial quantity of the substance that will undergo decay;
t_1/2 is the half-life of the decaying quantity.
We are given;
t_1/2 = 28.8 years
A₀ = 1 g
A(t) = 250 mg = 0.25 g
Thus;
0.25 = 1 * (¹/₂)^(t/28.8)
log 0.25 = (t/28.8) log (1/2)
-0.60206 = (t/28.8) * -0.3010
t = 2 * 28.8
t = 57.6 years
Read more about half life at; brainly.com/question/11152793
Sales tax is regressive, the second is progressive, and the third is proportional.
Pound was influenced here by the Japanese haiku form, which utilises images from nature to connect the momentary with the timeless, the miniature with the transcendent. The idea of people's faces being like 'petals' suggests their fragility and the brevity of life
nat-geo
Answer:
Your most important goal should always get most of your energy and attention.
Explanation:
Prioritization is one important aspect of any goal if one wants to achieve success. This means that one must 'list' the goals and aspirations one has so that it will be easy to deal with them.
Prioritization requires the person to list the goals so that the most important is at the top or first. This will ensure that the important goals will be focused more, with most of the energy and time given. Moreover, it will also help a person 'categorize' the aims and goals.
Thus, the correct answer is the fourth/ last option.
In English
En Ingles
By definition artificial intelligence is intelligence demonstrated by machines, unlike the natural intelligence displayed by humans animals, which involves consciousness and emotionality.
In Spanish
En Espanol
Por definición, la inteligencia artificial es la inteligencia demostrada por las máquinas, a diferencia de la inteligencia natural mostrada por los animales humanos, que involucra conciencia y emocionalidad.
