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
SpyIntel [72]
3 years ago
7

The half-life of a certain element is 100 days. How many half-lives will it be before only one-eighth of this element remains?

Physics
1 answer:
Natalka [10]3 years ago
7 0

Answer:

3

Explanation:

The half-life is the time it takes for the amount of radioactive isotope to halve. Therefore, we have:

- After 1 half-life, only 1/2 of the element will be left

- After 2 half-lives, only 1/4 of the element will be left

- After 3 half-lives, only 1/8 of the element will be left

So, it will take 3 half-lives for the element to become 1/8 of its original amount.

Mathematically, this can be also verified by using the equation

\frac{N(t)}{N_0}=(\frac{1}{2})^\frac{t}{\tau_{1/2}}

where

N(t) is the amount of the element left at time t

N0 is the initial amount of the element

\tau_{1/2} is the half-life

Substituting t=3\tau_{1/2} (3 half-lives), we find

\frac{N(t)}{N_0}=(\frac{1}{2})^3=\frac{1}{8}

You might be interested in
Which of these are part of our solar system? select all that apply
Len [333]
A)planets
b)the sun
c)moons
e)comets
f)asteroids
6 0
3 years ago
Read 2 more answers
What does the balloon of the air capacitor represent in an electrical capacitor?
bulgar [2K]

Answer:

The balloon prohibits the flow of air through the air capacitor.

Explanation:

Just like an electric capacitor has an insulator between the plates, the air capacitor has a balloon between the chambers.

6 0
3 years ago
Read 2 more answers
2 H2O2-> 2H20+02
Luden [163]

Answer:

This reaction is of the spontaneous decomposition of hydrogen peroxide down into water and oxygen. Add 2 molecules of hydrogen peroxide and 2 molecules of water. Since oxygen is naturally diatomic, the total number of atoms of each element is now the same on both sides of the equation so it is balanced.

3]Explanation: This reaction is of the spontaneous decomposition of hydrogen peroxide down into water and oxygen. Add 2 molecules of hydrogen peroxide and 2 molecules of water. Since oxygen is naturally diatomic, the total number of atoms of each element is now the same on both sides of the equation so it is balanced.

4]Two moles of hydrogen peroxide H2O2 decomposes to produce two moles of water H2O and one mole of oxygen gas O2(g) , which then bubbles off

6 0
2 years ago
The composition of the protoplanetary disk varies with distance from the protostar due to temperature.
lesantik [10]

Answer:

b) 1. Iron, silicates, carbon

   2. Water

   3. Methane, Ammonia, Carbon Dioxide.

Explanation:

Protoplanetry disk is the disk of gases and clouds of dust that rotates around the newly made star. The temperature of the protoplanetry disk actually determines the type of the planet that is to be formed. Inner part of the protoplanetry disk is closer to the sun thats why it is the hottest and denser part and composed of the materials like Iron, silicates, carbon as they have high melting points. Then comes those materials that exist in the solid form at lower temperatures such as the volatile materials like water. Ater that the protoplanetry disk is made of highly volatile materials that exists in solid from only at low coldest temperatures. So the outer part of the protoplanetry disk  is made up of the Methane, Ammonia and Carbon Dioxide.

7 0
3 years ago
Questions
astra-53 [7]

Answer:

1968

Explanation:

2400*20.5*0.004

8 0
3 years ago
Other questions:
  • Two spherical drops of mercury each have a charge of 0.10 nC and a potential of 300 V at the surface. The two drops merge to for
    7·1 answer
  • The separation in time between the arrival of primary and secondary waves is
    8·1 answer
  • James yap run fast while dribbling the ball as he crosses the middle part of the basketball court he changes his phase to avoid
    13·1 answer
  • In my solar system, we have a planet that is the innermost to our star that is exactly like the innermost planet in your solar s
    13·1 answer
  • How much heat is necessary to change 350 g of ice at -20 degrees Celsius to water at 20 Celsius?
    9·1 answer
  • How can this system be brought to equilibrium?
    10·1 answer
  • Type of pulley that has additional numbers of ropes that help to increase mechanical advantage
    14·1 answer
  • Consider a linear harmonic oscillator and let, yo and y, be its real, normalized ground and first
    11·1 answer
  • 6. Balsa wood with an average density of 130 kg/m3 is floating in pure water. What percentage of the wood is submerged
    9·1 answer
  • A) explain how the data matches each line on the graph (give name and line letter for each)
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!