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
Feliz [49]
3 years ago
12

10 A. How many years would pass if only 25% of the Potassium-40 radioactive elements are left?

Biology
1 answer:
kari74 [83]3 years ago
4 0

Answer:

The correct answer is -

A. 2.6 × 10^9 years.

B. two half-lives.

Explanation:

According to the question, the half-life of potassium-40 is, 1.3 × 10^9 years, which means it takes 1.3 billion years to decay or disintegrate half of the initial amount of the potassium.

The half-life of K-40 = 1.3 × 10^9

The number of half-life,  => (1/2)^2 = 1/4 (25% =1/4)

n = 2

number of half life = two

the time it takes = n*half lifetime

= 2 *1.3 × 10^9

=2.6 × 10^9 years.

You might be interested in
Why does this recent discovery about the Galapagos finches prove that it’s often challenging for scientists to determine when tw
yawa3891 [41]

Because of its similarities . It is the process by which organisms are most suited to their local environment to survive.

8 0
3 years ago
Read 2 more answers
Imagine that a researcher is studying a population of nerve cells known as the neural crest. In mice, when these cells fail to f
Svetlanka [38]
<h2>Neural crest </h2>

Explanation:

The neural crest likely forms: neurons and glia of the peripheral nervous system

  • The neural crest are bilaterally paired strips of cells arising in the ectoderm at the margins of the neural tube
  • In the body region, neural crest cells also contribute the peripheral nervous system (both neurons and glia) consisting of sensory ganglia (dorsal root ganglia), sympathetic and parasympathetic ganglia and neural plexuses within specific tissues/organs
  • The nervous system is made up of specialized cells which includes nerve cells (or neurons) and glial cells (or glia)
  • Neurons are the basic functional units of the nervous system, and they generate electrical signals called action potentials, which allow them to quickly transmit information over long distances
  • Glia are also essential to nervous system function, but they work mostly by supporting the neurons
7 0
3 years ago
At the start of an experiment, there are 30 bacteria in a dish. The bacteria population is expected to grow at a rate of 180% ea
Sliva [168]

Answer:

The answer is 40,479.

After,

Day 1- 84

Day 2- 235.2

Day 3- 658.56

Day 4- 1,843.968

Day 5- 5,163.1104

Day 6- 14,456.7091

Day 7- 40,478.7855

6 0
3 years ago
Help please someone please what is the answer
RideAnS [48]
This is actually true.
6 0
3 years ago
Read 2 more answers
Can someone help me with this 1-6
Elena L [17]

Answer:

1. sperm cell

2.testicles

3.egg

4.ovary

5.fertilization

6.fertilized egg = foetus

Explanation:

6 0
3 years ago
Other questions:
  • Coral bleaching can be hazardous to some fish species because
    5·1 answer
  • What would happen to a neuron if it was exposed to tetrodotoxin?
    5·1 answer
  • What are three types of arthropods ?
    10·2 answers
  • Describe the effect that exercise has on tidal volume, alveolar ventilation, and anatomical dead space compared to the resting r
    10·2 answers
  • When chromosomes become visible at the beginning of cell division what does each consist of?
    10·1 answer
  • Allopatric speciation is another name for.. speciation by geographic isolation. speciation due to genetic mutation
    10·1 answer
  • On the way to school, a student rides his bike to the bus
    13·1 answer
  • If the body plan of an animal is considered bilaterally symmetrical, ? A. The anterior and posterior ends are symmetrical B. The
    5·2 answers
  • Why is it important to ask a person who has an insect sting if they have had any prior serious reactions to insect stings
    7·1 answer
  • Is this right if not please tell me the right answer!
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!