Avantages and disadvantaes of dsm v criteria for substance abuse
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The Label of the the coronal view of the head based on the hints are given in the image attached.
<h3>What is a coronal view?</h3>The coronal view or plane is known to be called the frontal plane that is said to share or divides the body into different parts which is the dorsal and ventral portions.
Note that looking at the image attached, one can see that the frontal view of the parts of the eyes such as the eyes, nose are well labeled.
Hence, The Label of the the coronal view of the head based on the hints are given in the image attached.
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<h3>Answer:</h3>
60 days
<h3>Explanation:</h3>Half-life is the amount of time it takes half of a substance to decay away.
Guess and Check
One method for solving half-life problems like this is to guess and check. To do this, we can continue to divide 475mg by 2 until we get to 30mg.
- 475 ÷ 2 = 237.5
- 237.5 ÷ 2 = 118.75
- 118.75 ÷ 2 = 59.375
- 59.375 ÷ 2 = 29.6875
As seen here, it takes approximately 4 half-lives for this sample of Ra-225 to decay to 30mg. Now, we can multiply 4 by the length of the half-life, 15 days.
- 4 * 15 = 60 days.
Fractions
Another way to solve this is to use fractions.
- 30 is about 1/16 of 475
- 16 is equivalent to
.
This means that it takes 4 half-lives for 475mg to decay to 30mg. Using the same method above, we can tell that 4 half-lives are 60 days.
Important Note
In this question, I rounded occasionally. So, not all of the values are exact, but they are all very close.