1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
zmey [24]
3 years ago
13

If the half-life of a radioisotope is 10,000 years, the amount remaining after 20,000 years is

Chemistry
1 answer:
Cloud [144]3 years ago
6 0

Answer:

Considering the half-life of 10,000 years, after 20,000 years we will have a fourth of the remaining amount.

Explanation:

The half-time is the time a radioisotope takes to decay and lose half of its mass. Therefore, we can make the following scheme to know the amount remaining after a period of time:

Time_________________ Amount

t=0_____________________x

t=10,000 years____________x/2

t=20,000 years___________x/4

During the first 10,000 years the radioisotope lost half of its mass. After 10,000 years more (which means 2 half-lives), the remaining amount also lost half of its mass. Therefore, after 20,000 years, the we will have a fourth of the initial amount.

You might be interested in
An increase in greenhouse gases results in?​
grin007 [14]
An increase in the atmospheric concentrations of greenhouse gases produces a positive climate forcing, or warming effect. From 1990 to 2015, the total warming effect from greenhouse gases added by humans to the Earth's atmosphere increased by 37 percent.
5 0
3 years ago
So its not A so its B C or D plz help
Rainbow [258]

Answer:

the answer is B

hope this helped!

3 0
3 years ago
As you go down a family or group on the periodic table *
pickupchik [31]

Answer:

The elements become less reactive.

Explanation:

As we move from left to right across the periodic table the number of valance electrons in an atom increase. The atomic size tend to decrease in same period of periodic table because the electrons are added with in the same shell. When the electron are added, at the same time protons are also added in the nucleus. The positive charge is going to increase and this charge is greater in effect than the charge of electrons. This effect lead to the greater nuclear attraction and reactivity increases because of greater electron affinity.

As we move down the group atomic radii increased with increase of atomic number. The addition of electron in next level cause the atomic radii to increased. The hold of nucleus on valance shell become weaker because of shielding of electrons thus size of atom increased. The electron affinity decreases because of shielding effect and thus atom become less reactive.

7 0
3 years ago
What is the Gibbs free energy?
Dimas [21]
It's a thermodynamic quantity equal to the enthalpy minus the product of entropy and the absolute temperature
7 0
3 years ago
Read 2 more answers
Which has more calories: table sugar or aspartame?
Alina [70]
Aspartame produces 4 kilocalories of energy per gram when metabolized, While table sugar produces 3.9 kilocalories. However, aspartame is approximately 200 times sweeter than table of sugar, so it is consumed in much smaller doses. Then we can say that they're pretty much the same
3 0
3 years ago
Other questions:
  • In which situation is no work considered to be done by a force?
    15·2 answers
  • Help with the correct answer please
    7·1 answer
  • The number if particles in one molecule is?
    13·1 answer
  • If atoms are made up smaller parts such as electrons, why are atoms considered the basic unit of matter
    5·1 answer
  • A lime has a [H+] concentration of 0.0120 M.<br><br> What is the pH of the lime? 3 sig figs
    15·1 answer
  • When cells are dividing, it is
    9·1 answer
  • Which observations is the best evidence that unknown liquid X is a composed of only pure substance
    8·1 answer
  • A sample of krypton occupies 15.0 L at a pressure of 2.1 atm. Use Boyle's Law to find the pressure of the krypton when the volum
    6·1 answer
  • Explain how convection transfers heat. Use information from this video above. Make sure you include the words: heat, density, co
    6·2 answers
  • Identify the classification of milk. group of answer choices aerosol solid aerosol foam emulsion solid emulsion
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!