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
madreJ [45]
3 years ago
6

I have no idea so i'm screwed please help me

Physics
1 answer:
podryga [215]3 years ago
8 0

Answer:

Let N0 be the initial atoms of Be11

N0 / 2^1 = N0 / 2  Number of Be11 after 1 half-life

N0 / 2^2 = N0/ 4   Number of Be11 after 2 half-lives

30/13.81 = 2.17 half lives

N0 / 2^2.17 = N0 / 4.51 = .222 N0 or 22.2 % of atoms remain

You might be interested in
How are magnetic and electric fields similar?
Licemer1 [7]

Answer:

Similarities between magnetic fields and electric fields: ... Magnetic fields are associated with two magnetic poles, north and south, although they are also produced by charges (but moving charges). Like poles repel; unlike poles attract. Electric field points in the direction of the force experienced by a positive charge ...

Explanation:

copied and pasted from google. I copied and pasted your question into google and got this exact answer

Here is another thing from the same website just not shortened:

Similarities between magnetic fields and electric fields:

- Electric fields are produced by two kinds of charges, positive and negative. Magnetic fields are associated with two magnetic poles, north and south, although they are also produced by charges (but moving charges).

- Like poles repel; unlike poles attract

- Electric field points in the direction of the force experienced by a positive charge. Magnetic field points in the direction of the force experienced by a north pole.

Differences between magnetic fields and electric fields:

- Positive and negative charges can exist separately. North and south poles always come together. Single magnetic poles, known as magnetic monopoles, have been proposed theoretically, but a magnetic monopole has never been observed.

- Electric field lines have definite starting and ending points. Magnetic field lines are continuous loops. Outside a magnet the field is directed from the north pole to the south pole. Inside a magnet the field runs from south to north.

5 0
3 years ago
Read 2 more answers
Which statement did Ernest Rutherford make about atoms?
PtichkaEL [24]

Answer:

Option A

Explanation:

Ernest Rutherford concluded that the atom has a small, dense center which constitutes the mass of the whole atom. He called it a "Nucleus". He also said that most of the space in the atom is empty.

6 0
3 years ago
the weight of 80 kg of mass on mercury is 296 N and almost identical to the weight of the same mass on Mars but mercury has much
Dmitrij [34]
Where Gravity rely's on only mass and distance and nothing else, so the weight on the planets will vary like you have stated. However Mars is smaller than Mercury, so the weight on Mars will be less, and the weight on Mercury will be more. Think this way.

More Mass = More Gravity = More Weight

Less Mass = Less Gravity = Less Weight
3 0
3 years ago
Discuss one way in which global warming aggravates the effect of radiation​
alukav5142 [94]
The energy that then radiates out from the surface, longwave radiation, is trapped by the same greenhouse gases, warming the air, oceans, and land. This process, appropriately dubbed “the greenhouse effect,” is how global warming occurs.
3 0
3 years ago
Maria makes a graphic organizer to compare open, closed, and short circuits. She adds the labels shown.
Lina20 [59]
The Answer is Label 1:Y Label 2: W
7 0
3 years ago
Read 2 more answers
Other questions:
  • Three identical metal spheres are on insulating stands. Sphere A is given an initial charge of q. Sphere A is then briefly touch
    15·1 answer
  • How many magnitude 8 earthquakes does it take to equal the energy release for a magnitude 9 earthquake?
    14·1 answer
  • given a 60uC point charge located at the origin, find the total electric flux passing through: a) that portion of the sphere r=2
    6·1 answer
  • On June 9, 1983, the lower part of the Variegated Glacier in Alaska was observed to be moving at a rate of 64 m per day. What is
    8·1 answer
  • A body of volume 100cc immersed completely in water contained in a jar. The weight of water and jar before immersion of the body
    7·1 answer
  • What is time and speed and acceleration
    6·1 answer
  • 1.) A ball is thrown horizontally from the top of a building. What is the vertical velocity of the ball after 1 second?
    14·2 answers
  • 5b) how fast is the car going after 6 seconds?
    11·2 answers
  • 50 POINTS‼️‼️‼️‼️‼️
    11·2 answers
  • Please fast answerrr thank you​
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!