Ask question

Ask question

All categories

2 years ago

5

After 3 days a sample of radon-222 has decayed to 58% of its original amount.(

1 answer:

iren2701 [21]2 years ago

3 0

Half-life = [elapsed time * log (2)] / [log (begng amt / endg amt)]
half-life = (3 days * 0.30102999566) / log (1 / .58)
<span>half-life = 0.903089987 / log </span> (<span> <span> <span> 1.724137931)
</span></span></span>half-life = <span>0.903089987 / 0.23657200643</span>
half-life = <span> <span> <span> 3.8174 days

Source:
http://www.1728.org/halflife.htm

</span></span></span>

You might be interested in

A small half bath measures 42 inches by 48 inches.What is the square footage of the half bath?

Mkey [24]

A=LW, we are told that the dimensions are 42 and 48 so:

A=42*48

A=2016in^2

3 0

2 years ago

Read 2 more answers

Cell phone company charges$50 for an 800-minute monthly plan, plus an additional $0.22 per minute for every minute over 800. if

pentagon [3]

The most used minutes in a moth is 1013.

3 0

2 years ago

Solve the following y=x-5 and y=5x-13<br><br> a) (-4,5) <br> b) (-3,2)<br> c) (2,-3)<br> d) (2,3)

valentinak56 [21]

Answer is C
The x and y hit at (2,-3)

7 0

2 years ago

Loveland Colorado, is 18 km due south of Fort Collins and 31 km due west of Greeley, What is the distance between Fort Collins a

GalinKa [24]

Answer: The distance between Fort Collins and Greeley is 35.84 km.

Step-by-step explanation:

Since we have given that

Distance travelled due south of Fort Collins = 18 km

Distance traveled due west of Greeley = 31 km

So, using the pythagorous theorem, we will find the distance between Fort Collins and Greeley.

So, it becomes,

$H^2=B^2+P^2\\\\H^2=18^2+31^2\\\\H^2=324+961\\\\H^2=1285\\\\H=\sqrt{1285}\\\\H=35.84\ km\\\\$

So, the distance between Fort Collins and Greeley is 35.84 km.

8 0

2 years ago

How many posts does it take to support a fence around a square field measuring 100 feet on a side if posts are placed every 10 f

elena-14-01-66 [18.8K]

Answer:

10 Posts

Step-by-step explanation:

100ft. / 10ft.

it's is kind of simple

3 0

2 years ago