The time is 4:00 PM.
8 hours left in the day and 16 hours already passed.
To solve,
Hours left is a, so hours already passed = 2a.
We know a + 2a = 24
3a = 24
a = 8
2a = 16
So, time is 4 PM.
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To determine how many half-lives have passed, you would need to divide the total time passed by the half-life of the substance. The result would give you the number of half-lives that have occurred.
It's 2 and a half hours, you've already answered it!
1/16 remains 12 hours is 1/2 24 hours is 1/4 36 hours is 1/8 48 hours is 1/16
If ' L ' is the number of days in one half-life, then the number of half-lives in 32 days is (32 / L) .
The number is already rounded to a greater extent than that!
24
Whole numbers are already rounded to the nearest half.
To determine the amount of potassium-42 left after 62.0 hours, we need to use the half-life of potassium-42 which is 12.4 hours. Calculate the number of half-lives that have passed (62.0 hours / 12.4 hours) = 5 half-lives. Each half-life halves the amount, so 1/2^5 = 1/32. Therefore, there will be 848 g * (1/32) = 26.5 g of potassium-42 left.
276 hrs (11.5x24)
To determine how much of the 745 g sample of Potassium-42 will remain after 74.4 hours, we first calculate the number of half-lives that have passed. Since the half-life is 12.4 hours, we divide 74.4 hours by 12.4 hours, which gives us 6 half-lives. After each half-life, the amount remaining is halved, so after 6 half-lives, the remaining mass is ( 745 , \text{g} \times \left(\frac{1}{2}\right)^6 = 745 , \text{g} \times \frac{1}{64} \approx 11.64 , \text{g} ).
There is 30 minutes in a half hour. There is no hours in half hours.
There are 60 minutes in one hour, so to find the number of minutes in 13 and a half hours, you would multiply 13 by 60 and add half of 60. This gives you 13 x 60 + 30 = 810 minutes in 13 and a half hours.