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
LiRa [457]
3 years ago
14

The table below shows the initial and final masses of a radioactive material whose half-life is 15 years.

Biology
2 answers:
Murljashka [212]3 years ago
7 0

Answer:

A

Explanation:

1 half-life = .4 kg = 15 years

2 half-life = .2 kg = 30 years

3 half-life = .1 kg = 45 years

4 half-life = .05 kg = 60 years

Burka [1]3 years ago
4 0

Answer:

A

Explanation:

Initial mass is 8. The half-life is 15 years.

1st half life=.8/2=.4

2nd half life=.4/2=.2

3rd half life=.2/2=.1

4th half life=.1/2=.05

For each half life that it took it to go from .8 to 0.05, you add 15 years since that is the half life of the substance. 4*15=60.

So, the answer is A. The material decayed from 0.8 kilograms to 0.05 kilogram in 60 years.

You might be interested in
How does iodine from the blood enter the thyroid cells
s2008m [1.1K]

Answer:

Iodine, or more accurately iodide (I-), is avidly taken up from blood by thyroid epithelial cells, which have on their outer plasma membrane a sodium-iodide symporter or "iodine trap". Once inside the cell, iodide is transported into the lumen of the follicle along with thyroglobulin.

Explanation:

4 0
3 years ago
Read 2 more answers
Suppose you have an X ray of an arm, which is taken because the doctor suspects a bone is broken. You also have a drawing showin
Vesnalui [34]

Answer:

An X-ray is done to diagnose the position of bones in the body whether its broken or not or in right place or not.

An X-ray machine is turned on to provide a visual of the bones showing bone condition. When the machine is turned on, X-ray travel through the body tissues, and due to the presence of calcium in bones, they absorb more X-rays, thus bones appear white against the black background of a radiograph.

These white bones on the radiograph will show the position of bones whether it's broken or not.

So, both the visuals that is X-ray and drawing showing visuals (the bones appear white) contribute valuable data to the given situation.

5 0
4 years ago
What molecules are created during photosynthesis
bija089 [108]
Photosynthesis is a process which plants make their own food by the help of sunlight and use their chemical processes we can called autotrophs.
5 0
3 years ago
Give an example of a prokaryotic cell.
ElenaW [278]

Answer:

Bacteria are examples of the prokaryotic cell type. ... In general, prokaryotic cells are those that do not have a membrane-bound nucleus. In fact "pro-karyotic" is Greek for "before nucleus". Besides bacteria, the cyanobacteria (blue-green algae) are a major group of prokaryotes.

7 0
3 years ago
Read 2 more answers
Ne all the organ system you would use while sitting at the lunch table eating a carrot
Fittoniya [83]
Respiratory System

Circulatory System

Digestive System<span />
5 0
3 years ago
Other questions:
  • What type of acid is currently of principal concern when dealing with acid rain?
    5·1 answer
  • What is expected to happen to the number of people sixty years and older in the developed world by the year 2050? To what can th
    12·1 answer
  • Water is an important biomolecule. o True False​
    15·1 answer
  • Explain why it is important to consider the role of humans when we learn about environmental science.
    14·1 answer
  • When all the values in a data set are written in order from least to greatest, the value that is in the middle, with an equal nu
    10·2 answers
  • The___is also called the dark reaction in photosynthesis
    9·1 answer
  • In RNA, A matches with <br> A. U<br><br> B. G<br><br> C. T<br><br> D. C
    14·1 answer
  • Which of the following most accurately describes the pattern of immune system functioning during each stage of the general adapt
    12·1 answer
  • I am found in plant cells. I am rigid, strong &amp; stiff. I give support to the plant cell. I give the cell it's box shape
    11·1 answer
  • Describe four features of bacteria that enable them to survive in a wide variety of habitats
    5·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!