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lilavasa [31]
3 years ago
10

Manganese-52 has a half-life of 6 days. How many days would a scientist have to wait for the radioactivity to be 12.5% the start

ing amount?
Physics
2 answers:
Dahasolnce [82]3 years ago
5 0

Answer:

18 Days

Explanation:

sineoko [7]3 years ago
4 0

Answer:

Let N = N0 where N0 is the number of atoms originally present.

In 6 days    N = N0 / 2

In 12 days   N = N0 / 4

In 18 days   N = N0 / 8    = .125 N0

So it would take 18 days.

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Anastaziya [24]
D- if i was right please mark me as a brainliest answer and a thank you
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3 years ago
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The ball of a ballpoint pen is 0.5 mm in diameter and has an ASTM grain size of 12. How many grains are there in the ball
Fudgin [204]

Given :

The ball of a ballpoint pen is 0.5 mm in diameter and has an ASTM grain size of 12.

To Find :

How many grains are there in the ball?

Solution :

Volume of ball of the ballpoint is :

V = \dfrac{4 \pi r^3}{3}\\\\V = \dfrac{4\times 3.14 \times 0.5^3}{3}\ mm^3\\\\V = 0.523\  mm^3

Now, grain size of 12 has about 520000 grains/mm³.

Therefore, number of grains are :

n = 520000\times 0.523\ grains\\\\n = 271960\ grains

8 0
3 years ago
A large bottle contains a number of medicinal tablets is 0.5kg. Calculate the number of tablets in the bottle?
Alexeev081 [22]

Answer:

the answer is 5k in the bottle have

8 0
3 years ago
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faust18 [17]
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7 0
2 years ago
The downward force produced when air flows over the winglike spoiler on a race car is an example of ___ principle
Murljashka [212]

As per bernoulli's principle

P_1 + \frac{1}{2}\rho v_1^2 = P_2 + \frac{1}{2}\rho v_2^2

here

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now from this equation we can say that the pressure difference will be

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now the force due to this pressure difference will be

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5 0
3 years ago
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