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
DedPeter [7]
3 years ago
14

How much of a 100 g sample of radon-222 will remain unchanged after 7.64 days?

Physics
1 answer:
Lunna [17]3 years ago
6 0

The half-life of a substance describes the time in which it takes for half of the radioactive isotope to decay into another form. In your question, it says that the half life of radon-222 is 3.82 days; in a 100g sample of radon, 3.82 days pass and 50g of that isotope is left.

7.64 days is the equivalent to two half lives (7.64/3.82), so only half of half of 100%, or 25%, of the isotope would remain. The answer is D

Hope that helps

You might be interested in
How can we use thermal energy to our advantage?
devlian [24]

Answer:

One of the primary advantages of thermal power is that the generation costs are extremely low. No fuel is needed to generate the power, and the minimal energy needed to pump water to the Earth's surface can be taken from the total energy yield.

Explanation:

8 0
3 years ago
Read 2 more answers
According to Newton, which of these will determine if and how an object will move?
mr Goodwill [35]

Answer:

3

Explanation:

5 0
3 years ago
What is the function of the phytoplankton in ocean ecosystems?
vesna_86 [32]
Ok ok! It's A. Producer
5 0
3 years ago
Pouvez vous m'aider dans ce devoir sil vous plait.​
ahrayia [7]

in english please

i don't understand actually

8 0
3 years ago
A pressure cooker contains water and steam in equilibrium at a pressure greater than atmo-spheric pressure. How does this greate
Amanda [17]

Answer:

As the pressure inside the pressure cooker increases as it is heated, the temperature also increases.

Explanation:

A pressure cooker contains water and steam in equilibrium at a pressure greater than atmospheric pressure.

According to the ideal gas law, as the pressure increases, the temperature also increases.

As the pressure inside the pressure cooker increases as it is heated, the temperature also increases.

6 0
3 years ago
Other questions:
  • At what distance from a long, straight wire carrying a current of 8.7 A is the magnetic field due to the wire equal to the stren
    8·1 answer
  • Which best describes how the sun rotates?
    10·2 answers
  • What kinds of telescopes are used to measure parallax
    10·1 answer
  • What concerns people in regards to<br> the federal government?
    9·1 answer
  • The earth's magnetic fleld extends:
    12·2 answers
  • The theory of nuclear astrophysics is that all the heavy elements like uranium are formed in the interior of massive stars. Thes
    12·1 answer
  • 1. Which of the following best describes a nebula?
    11·1 answer
  • Kinatic energy dependes on[statitic/dymamic]condition of body
    14·1 answer
  • A 0.07 kg tennis ball, initially at rest, leaves a racket with a speed of 56 m/s. If the ball is in contact with
    10·2 answers
  • what is the change in thermal energy of 1.00 kg of water that is raised from 20.0 degrees Celsius to boiling point?​
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!