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
suter [353]
3 years ago
5

Suppose that the half-life of an element is 1000 years. How many half-lives will it take before one-eighth of the original sampl

e remains?
8
125
12.5
3
Physics
2 answers:
Zina [86]3 years ago
4 0

Answer:

the answer is 3

Explanation:

34kurt3 years ago
3 0

Answer:

3

Explanation:

The half-life of a radioactive isotope is the time it takes for the mass of the sample to halve.

This can be rewritten as follows:

m(t) = m_0 (\frac{1}{2})^n

where

m(t) is the mass of the sample at time t

m0 is the original mass of the sample

n is the number of half-lives that passed

We see that if we take n=3, the amount of original sample left is

m(t) = m_0 (\frac{1}{2})^3 = m_0 (\frac{1}{8})

So 3 (3 half-lives) is the correct answer.

You might be interested in
According to the Law of Conservation of Energy, why does the first hill on a roller coaster always have to be the tallest of all
enyata [817]
Because it generates enough momentum to keep the train going with out really having to speed up
5 0
3 years ago
The concentration of sodium and potassium ions in the blood and body fluid is regulated by :
Liula [17]

Answer:

Kidney

Explanation:

One of the main function of the kidney is to maintain the homeostasis of sodium and potassium ions in the blood and body.

Aldosterone is a key steroid hormone that balances sodium and potassium ions in the blood and body fluid. Potassium and sodium ions generate electric impulse in the body which helps to perform different activities such as muscles flexing.

Kidney function for reabsorption and secretion, in which reabsorption of Na is done nd balances the sodium and potassium in the blood and body.

6 0
3 years ago
A machine is rolling a metal cylinder under pressure. The radius of the cylinder is decreasing at a constant rate of 0.05 inches
Luden [163]
Yes, the volume of the cylinder will remain constant. As the radius decreases, the height will increase to make sure that the volume is kept the same.
We have been given a value of dr/dt and are required to find dh/dt
Because the volume is constant, we can plug it into the formula for the volume of the cylinder and rearrange it to make h the subject:
128 = πr²h
h = 128/πr²
Now we differentiate both sides:
dh/dr = -256/πr³
Applying the chain rule:
dh/dt = dh/dr x dr/dt
dh/dt = (-256/πr³) x -0.05
dh/dt = 64/5πr³; substituting the value of r
dh/dt = 64/5π(1.5)³
dh/dt = 1.21 in/sec
4 0
3 years ago
Solar system help please!
Kobotan [32]
When one body(sun) exerts a force on a second body(planet), the second body simultaneously exerts a force equal in magnitude and opposite in direction of the first body. Which makes the planet orbit in path C.

Hope this helps!!
5 0
2 years ago
Which of the following shows resistors in a parallel circuit
Alexeev081 [22]

The bottom drawing do

7 0
2 years ago
Read 2 more answers
Other questions:
  • ANSWER ASAP. TIMED! FILL IN THE BLANK PLZZZ
    12·1 answer
  • A Solid, rectangular block of material floats on water is it possible that the block is pure gold?
    12·1 answer
  • If an airplane is flying directly north at 300.0 km/h, and a crosswind is hitting the airplane at 50.0 km/h from the east, what
    7·1 answer
  • One hundred turns of insulated copper wire are wrapped around an iron core of cross-sectional area 0.100m2. As the magnetic fiel
    15·1 answer
  • A boy pushes a cart with a constant velocity of 0.5m/s by applying a force of 60 N. What is the total frictional force acting on
    9·1 answer
  • How does solar altitude affect the length of the path of solar radiation through earth’s atmosphere?
    14·1 answer
  • Evangelista Torricelli was the first person to realize that we live at the bottom of an ocean of air. He correctly surmised that
    14·1 answer
  • Work is defined as the use of force to move an object in the direction of that force and is equal to the force times the distanc
    6·1 answer
  • Two cars are traveling at the same speed of 27 m/s on a curve thathas a radius of 120 m. Car A has a mass of 1100 kg and car B h
    8·1 answer
  • Jerry the mouse is running along a straight desert road at a constant velocity of 18 m/s. If a certain Tom cat wants to capture
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!