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BartSMP [9]
3 years ago
15

What is meant by the half-life of an unstable element?

Geography
1 answer:
geniusboy [140]3 years ago
7 0

Answer:

Half-life is defined as the time required by an unstable element to reduce half of its original value. All unstable elements have a decay rate and this half-life differs from element to element. These unstable elements are known as radioactive elements. It continuously decays until it becomes a stable one. These elements when decays release radiations which are harmful to lives.

This half-life plays an important role in the determination of the age of a rock or fossils. It is used in various types of radiometric dating methods.

For example, the half-life of Carbon-14 is approximately 5700 years and the half-life of Uranium-238 is 4.5 billion years.

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Which of the following statements most accurately describes current population trends in Russia?
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The population is increasing due to high birthrates and low death rates and this statement among the following statements given in the question most accurately describes current population trends in Russia. The correct option among all the options given in the question is the second option.
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Although African Americans and Hispanics represent only about one-quarter of the U.S. population, they account for about two-thi
Natalka [10]

Answer:

Answer is AIDS.

It should be noted that the question is incomplete. It ends with a question " of which disease".

Explanation:

African Americans are people of America of Africa origin,while the Hispanics are people which their origin can be traced back to Spain or any Spanish speaking countries.

AIDS means Acquire Immunodeficiency Syndrome which is being caused by a virus known as human immunodeficiency virus. AIDS occurs when the natural body protection is being destroyed. This will make the level of immunity of the body to become extremely low, and will eventually create avenue for the manifestations of the opportunistic infections.

The HIV target the immune system, and when the immune system is being overpowered by the virus results to AIDS.

There is no known drug to cure AIDS, but antiretroviral drugs can be used to suppress the activity of the virus.

The virus can be contacted through the following means

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2. Sharing of sharp object such as blade, clipper, with infected person

3. Transfusion of unscreened blood.

4. Transmission from infected mother to unborn child or during birth.

Some of the ways to prevent yourself from contacting the virus.

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* Blood should be screened before transfusion.

5 0
3 years ago
Somone help i was not paying any attention to my class​
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Answer:

Solar energy, Wind energy, Hydro energy, etc.

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It's because they can be replenished in ashort amount of time. Hopefully that Helped!

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