Thorium-234 has a half-life of 24 days. How many grams of thorium-234 would remain from 100 g after 72 days? Show your problem-solving technique.

Answers

Answer 1

Answer:

[tex] \underline{ \boxed{12.5 g }}\: of \: (thorium-234 ) \\ \: would \: remain \: from \: \\ 100 g \: after \: 72 \: days[/tex]

Explanation:

[tex]if \: (Thorium-234) \: has \: a \: (half-life )\: of \: 24 \: days \\ then \: : it \: will \: disintegrate \: into \: \frac{1}{2} \: of \: 100g \\ but \: after \: 72 \: days \: i.e \: (24 \times 3)days \\ it \: will \: reduce \: to\:half \: its \: original \: ( \times 3) \\ hence \to \: \\ \frac{100}{ {2}^{3} } = \frac{100}{8} = \frac{25}{2} = \underline{ \boxed{12.5g}}[/tex]


Related Questions

shyla's resarch shows that 8 empty cans make 1/4 pound of aluminum. shayla wants to know how many cans it take to make 5 pounds of aluminum.

Answers

Explanation:
If 8 cans is 1/4 then 8 x 4 is 32 which is 4/4 or 1. 32 x 5 = 160

Answer:
160 cans

Answer:

If 8 cans is 1/4 then 8 x 4 is 32 which is 4/4 or 1. 32 x 5 = 160

Explanation:

160 cans

Kindergarten is the first year of
O pre-school
day-care
elementary school
O middle school
O :
other

Answers

Answer:

Kindergarten is the first year in most elementary schools. Hope this helps!

Students have to pay to go to
4 points
kindergarten
high school
middle school
private school
Other:

Answers

Students have to pay to go to college, so I would say other. Although, parents do have to pay for their kids to go to private school. Hope this helps!

Which of the following pairs of angles is not necessarily congruent

Answers

Answer:

E. [tex]\angle 3[/tex] and [tex]\angle 5[/tex].

Explanation:

According to the figure, we have the following conclusions:

1) [tex]\angle 1[/tex] and [tex]\angle 2[/tex] are vertical opposite angles. ([tex]m \angle 1 = m \angle 2[/tex])

2) [tex]\angle 2[/tex] and [tex]\angle 3[/tex] are internal alternate angles. ([tex]m \angle 2 = m\angle 3[/tex])

3) [tex]\angle 2[/tex] and [tex]\angle 4[/tex] are corresponding angles. ([tex]m\angle 2 = m\angle 4[/tex])

4) [tex]\angle 3[/tex] and [tex]\angle 4[/tex] are vertical opposite angles. ([tex]m \angle 3 = m \angle 4[/tex])

But, [tex]\angle 3[/tex] and [tex]\angle 5[/tex], since [tex]m \angle 3 + m\angle 6 + m\angle 5 = 180^{\circ}[/tex], where [tex]\angle 3[/tex] is an acute angle and [tex]\angle 6[/tex] is a right angle, and [tex]m \angle 4 + m \angle 5 = 90^{\circ}[/tex]. Then,

[tex]m\angle 5 = 90^{\circ} -m\angle 4[/tex].

[tex]m\angle 5 = 90^{\circ}-m\angle 3[/tex]

Hence, the right answer is E.

In U.S., children usually have to go to school when they are
O three years old
о
four years old
five years old
six years old
O
Other:

Answers

Explanation:

In the USA, children start school when they are five or six years old. Depending on the state, schooling is compulsory until the age of 16 or 18. Children younger than five can go to a nursery school or preschool.

It’s usually 5 years old

7. It is a marketing strategy in which the owners convince the consumers or buyers to have a free taste of
use of the product.
a. Free sample marketing b. Retalling
c. Selling in the farm
d. Word-of-mouth marketing
8. The following are steps in making brochure, which of this is not included?
a. Determine the audience for your message.
b. Decide the purpose of your brochure.
C. Think about the message you want to convey to your readers.
d. Give directly to the audience without even text.
9. It is a way of obtaining products where customers go directly to the farm to buy
a. Free sample marketing b. Retailing
c. Selling in the farm d. Selling through Cooperatives​

Answers

Answer:

7. Free sample marketing.

8. Give directly to the audience without even text.

9. Selling in the farm.

Explanation:

7. Free sample marketing can be defined as a marketing strategy in which the owners convince the consumers or buyers to have a free taste or use of the product. The main purpose of free sample marketing is to create a massive awareness of a product, most especially a new product and to  gain consumer trust.

8. A brochure can be defined as a book or pamphlet comprising of texts or images usually for the promotion of goods and services. Thus, it is usually given to potential customers or consumers by a salesperson.

The following are steps in making brochure;

a. Determine the audience for your message.

b. Decide the purpose of your brochure.

c. Think about the message you want to convey to your readers.

9. Selling in the farm can be defined as a way of obtaining products, where customers go directly to the farm to buy. Therefore, in this type of market, the farmers sells their crops or produce directly to the customers without any middleman such as retailers or wholesalers.

The author regards the river as
A a friend.
B an obstacle.
C an inspiration.
D a threat.

Answers

More information is needed to solve this question
We need more information about this

When might it be most helpful to clear your browser's cache of temporary Internet files?

Answers

Answer:

when you look at errotic videos

Explanation:

really?

It’s a good idea to clear it every few weeks.
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