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Hoochie [10]
4 years ago
11

An area with excess electrons has a net _____ charge; an area with a deficit of electrons has a net _____ charge. Question 10 op

tions: negative, positive positive, negative positive, neutral negative, neutral
Physics
1 answer:
Ivenika [448]4 years ago
8 0

Answer:

negative, positive

Explanation:

A we know that the electrons have a negative charge.

So, when a body has some excess electrons, it means it has negative charge.

When a body has an deficiency of eletrons, it means it gains a positive charge.

An area with excess electrons has a net _<u>negative</u>__ charge; an area with a deficit of electrons has a net _<u>Positive</u>____ charge.

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The half-life of cobalt is 5.26 years. If 10 grams are left after 15.78 years, how many grams were in the original sample?​
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Explanation:

This problem can be solved using the <u>Radioactive Half Life Formula</u>:

A=A_{o}.2^{\frac{-t}{h}}   (1)

Where:

A=10g is the final amount of the material

A_{o} is the initial amount of the material (the quantity we are asked to find)

t=15.78y is the time elapsed

h=5.26y is the half life  of cobalt

Knowing this, let's find A_{o} from (1):

A_{o}=\frac{A}{2^{\frac{-t}{h}}}  

A_{o}=A.2^{-\frac{-t}{h}}  

This is the same as:

A_{o}=A.2^{\frac{t}{h}}   (2)

A_{o}=(10g)(2)^{\frac{15.78y}{5.26y}}  

A_{o}=(10g)(2)^{3}  

<u>Finally:</u>

<u></u>

A_{o}=80g>>> This is the amount of grams in the original sample

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