U didn’t include the addition sign or sub sign for some of them
Answer:-3
Step-by-step explanation:
Answer:
D. 1.25 grams
Step-by-step explanation:
Half-life is: 0.004 sec
Time spent : 0.016 sec
Quantity = 20 gram
In order to find the material after 0.016 sec, we have to calculate how many number of half-lives have been passed
No. of half-lives passed = 0.016/0.004
= 4
The number of lives passed will be raised to the power of 0.5.
0.5 ^ 4 = 0.0625
The answer will be multiplied with the quantity we started with.
Remaining material is:
20*0.0625 = 1.25 grams
Hence, Option D is correct ..
4.5 x 10^-5 is just 0.00045 and 1 x 10^-3 is 0.001
Using formula A=4πr2
A=π⅓(6V)⅔=π⅓·(6·288)⅔≈210.90123
So area is apprix 210.9
