Answer:
Approximately 3318 disintegrations per minute.
Explanation:
The activity
of a radioactive decay at time
can be found with the following equation:
.
In this equation,
is the natural base.
.
is the initial activity of the decay. For this question,
.- The decay constant
of this sample needs to be found.
The decay constant here can be found using the activity after 10 days. As long as both times are in the same unit (days in this case,) conversion will not be necessary.
.
.

Apply the natural logarithm to both sides of this equation.
.
.
.
Note that the unit of the decay constant
is
(the reciprocal of days.) The exponent
should be dimensionless. In other words, the unit of
should also be days. This observation confirms that there's no need for unit conversion as long as the two times are in the same unit.
Apply the equation for decay activity at time
to find the decay activity after 47.2 days.
.
By dimensional analysis, the unit of activity here should also be disintegrations per minute. The activity after 47.2 days will be approximately 3318 disintegrations per minute.
So they can predict what happens next
Answer:
Let's start with the fact that cereals , are made of grains and are mostly carbohydrates. therefore they contain carbon oxygen and hydrogen. They also contain proteins so have nitrogen. Plants have the minerals that are in the soil where they grow, so the list you have is correct. They also generally have added vitamins ad minerals. The vitamins contain C, H, O N, and a few others such as sulfur, The added minerals might contain:copper, iron, zinc, cobalt, selenium, silicon and molybdenum .
Mark me as brainliest if it was helpful
You could check if their cells had a nucleus or not. If it did it would be a eukaryote, if it did not then it would be a prokaryote.
Answer:
4.254320865115cm or simplied 4.25cm
Explanation: