Answer:
Option C. 2 half lives.
Explanation:
The following data were obtained from the question:
Original amount (N₀) = 1000 atoms
Amount remaining (N) = 250 atoms
Number of half-lives (n) =?
Half-life is defined as the time taken for the substance to reduce to half its original side. Mathematically, it can be obtained as follow:
N = 1/2ⁿ × N₀
N is the amount remaining.
n is the number of half-lives.
N₀ is the original amount.
Using the above formula, we can obtain the number of half-lives as follow:
Original amount (N₀) = 1000 atoms
Amount remaining (N) = 250 atoms
Number of half-lives (n) =?
N = 1/2ⁿ × N₀
250 = 1/2ⁿ × 1000
Cross multiply
250 × 2ⁿ = 1000
Divide both side by 250
2ⁿ = 1000/250
2ⁿ = 4
Express 4 in index form
2ⁿ = 2²
n = 2
Therefore, it will take two (2) half lives for the amount to get to 250 atoms.
In case the question gets cut off: which world map below shows the locations of major plate boundaries where most earthquakes and volcanoes occur on earth?
Answer: folding, followed by erosion
Explanation:
Earth has been cooling since its formation, if this is the case, why is it still hot inside?
A Peridotite xenoliths
B Planetesimals crashing into each other
C Radioactive decay
D Seismic waves
Answer:
Siesmic waves
Explanation:
What are three differences between brittle and plastic strain (may include both characteristics of the strain as well as the conditions and locations where each type of strain occurs), and give an example of the type of structure (deformation feature) associated with each type of strain. Make sure you clearly identify which type of strain is associated with each different trait and feature.
Answer:
elastic deformation: the rock returns to its original shape when the stress is removed.
plastic deformation: the rock does not return to its original shape when the stress is removed.
fracture: the rock breaks.
Explanation:
Stress is the force applied to an object. In geology, stress is the force per unit area that is placed on a rock. Four types of stresses act on materials.
A deeply buried rock is pushed down by the weight of all the material above it. Since the rock cannot move, it cannot deform. This is called confining stress.
Compression squeezes rocks together, causing rocks to fold or fracture (break) (figure 1). Compression is the most common stress at convergent plate boundaries.
Rocks that are pulled apart are under tension. Rocks under tension lengthen or break apart. Tension is the major type of stress at divergent plate boundaries.
When forces are parallel but moving in opposite directions, the stress is called shear (figure 2). Shear stress is the most common stress at transform plate boundaries.
Stress In Earth’s Crust
Enormous slabs of lithosphere move unevenly over the planet’s spherical surface, resulting in earthquakes. This chapter deals with two types of geological activity that occur because of plate tectonics: mountain building and earthquakes. First, we will consider what can happen to rocks when they are exposed to stress.
Which of the following is cause of Decertification
Answer:
ion even know man ahaha
In case the question gets cut off: which world map below shows the locations of major plate boundaries where most earthquakes and volcanoes occur on earth?
Answer:
The map labeled with 1 shows the major plate boundaries and where most of the earthquakes and volcanoes occur.
Explanation:
The map labeled with number 1 is showing us the plate boundaries. This can easily be confirmed as the lines that are drawn are in the exact same places where the plate boundaries are located. The plate boundaries are the places that are tectonically the most active on Earth, with earhtquakes and volcanoes being a regular occurrence.
Not all plate boundaries though have around the same intensity of earthquakes or number of volcanoes. This is due to the difference in plate boundaries. At the convergent plate boundaries (depending is it between two continental, continental and oceanic, or two oceanic) there can be the formation of volcanoes or mountain ranges, with earthquake activity varying a lot. At transform boundaries, there isn't volcanic activity but there are a lot of earthquakes. At divergent boundaries, earthquakes are rare, but there is intense and constant volcanic activity.
The three most common government systems include confederate, federal, and __________ governments.
Answer:
Unitary System
Explanation:
You answer would most likely be A:Untiary
Thank you for the question!
What is a possible theme of every day use?
Answer:
The main themes in Alice Walker's “Everyday Use” are the Black Consciousness movement, rural versus urban Black identity, and tradition, heritage, and ownership.
Explanation:
some one plz help me with this test answer
Answer:
B
Explanation:
I read about it in my class
Hi nevah! ive been answering some of your questions, have a godly day! :D
Where do you live in this complex ?
Answer:
no not really you just say where you live at
Explanation: