Four radioactive 10-gram (g) samples with their remaining isotope mass are listed in the table that spans 50 years.
Which isotope would be expected to have the longest half-life?
PLEASE GIVE ME THE CORRECT ANSWER (THANK YOU IN ADVANCE.) no links please, Just the answer.
A.
Silver-108
B.
Mercury-194
C.
Californium-249
D.
Americium-241
10 years 9.84 g 9.80 g 9.84 g 9.85 g
20 years 9.68 g 9.61 g 9.67 g 9.69 g
30 years 9.53 g 9.42 g 9.51 g 9.54 g
40 years 9.38 g 9.24 g 9.36 g 9.39 g
50 years 9.23 g 9.06 g 9.20 g 9.25 g
Americium-241 isotope would be expected to have the longest half-life. Hence, option (D) is correct.
What is half-life?
In radioactivity, the half-life is the time required for one-half of a radioactive sample's atomic nuclei to decay (change spontaneously into other nuclear species by emitting particles and energy), or, equivalently, the time required for the number of disintegrations per second of a radioactive material to decrease by one-half.
According to given data:
Rate of decay is the highest for Mercury-194, hence, its half-life is least. Then rate of decay is lowest for Americium-241, hence, its half-life is the longest. Hence, option (D) is correct.
The order of half-life according to the data is:
Americium-241 > Silver-108 > Californium-249 > Mercury-194.
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NEED IN 5 MINUTES
Why do you think it’s necessary for meteorologists (weather scientists) to study multiple types of data when
predicting upcoming weather? Which types of data are important
sorry i didnt get this intime.....i hope you did well in whatever you did
Explanation:
ill give 50 points aNd brainiest to who ever gives the best answer, its due in 30 minutes , please help
Explain in 200 words the process that causes dew to form on blades of grass.
no links or saying random things.
dont answer just for points i will report ur answer.
Answer:dew is formed on grass
Explanation:Dew forms when the object, such as the glass, cools down to the dew point temperature. Water molecules in the air continually bombard surfaces, like blades of grass. ... If the object gets cold enough, and there is enough moisture in the air, condensation is much greater than evaporation and the film grows into dew drops.
Answer:
Hope the answer helps you!!
Have A nice day!!
Pls mark as Brainliest
Explanation:
Dew forms when the object, such as the glass, cools down to the dew point temperature. Water molecules in the air continually bombard surfaces, like blades of grass. ... If the object gets cold enough, and the air contains enough moisture, condensation exceeds evaporation, and the film grows into dew drops
As fall begins, we have lots of mornings with dew on the grass. To explain this, we start with the fact that air contains water in the gas phase, called water vapor. Dew is made of liquid water that has condensed from that water vapor.
Dew occurs when objects cool, such as when drops of liquid form on the outside of an ice-cold drink glass. Dew forms when the object, such as the glass, cools down to the dew point temperature.
Water molecules in the air continually bombard surfaces, like blades of grass. Some of the molecules stick, forming a very thin film of water. This film may not last long, as the water is also evaporating. The evaporation rate depends on the water temperature, which equals the temperature on the grass.
So condensation depends on the state of the atmosphere (primarily temperature and moisture), while evaporation depends on the temperature of the object. If the object gets cold enough, and the air contains enough moisture, condensation exceeds evaporation, and the film grows into dew drops.
Each night the weather report includes the temperature and the dew point temperature. If the two temperatures are close, dew is likely during the night. Because wind and cloudy skies keep the ground from cooling, dew also tends to form on calm nights with clear skies.
Which characteristics belong to Whittaker’s classification system? Select two options.
a.three domains
b.six domains
c.two kingdoms
d.five kingdoms
e.five levels
f.seven levels
g.eight levels
Answer:
Five kingdoms & Seven levels
Explanation:
Robert H. Whittaker proposed five kingdom classical system for living organisms in 1969. These were: Kingdom Monera, Kingdom Protista, Kingdom Fungi, Kingdom Animalia, and Kingdom Plantae. His work was the improvement of earlier work conducted by Carl Linnaeus who proposed three kingdom classification system (Animalia, Plantae, and Protista).
Whittaker's system further categorized each kingdom to seven levels. These were: Kingdom → Phylum → Class → Order → Family → Genus → Species. This categorization was based on similarities in organisms at different levels.
PS: The scientific name of each organism is the combination of genus and family name.
what is the relationship between the evolution of marsupials and the movement of earths tectonic plate? 8th Grade No links or files Please
The relationship between the evolution of marsupials and the movement of earths tectonic plate is that the marsupials migrated to different continents during the drift.
What is meant by evolution ?Evolution is defined as the gradual and cumulative processes by which the traits of biological population and the diversities changed over time.
Here,
The movement of tectonic plates of earth resulted in the continents to break apart into various isolated parts. During this movement of the tectonic plates, the group of organisms that were living at some continents got split from the actual habitats and were driven to different isolated community of organisms.
As a result, the marsupials who were inbreeding within their habitats were reproductively isolated to different parts of the earth. Thus they got adapted to the new areas and resulted in the creation of new species which is called the evolution of marsupials.
Hence,
The relationship between the evolution of marsupials and the movement of earths tectonic plate is that the marsupials migrated to different continents during the drift.
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PLZZZZZ! HELP! I'll give brainliest to the first correct answer, five stars, and a heart!
Answer:
frequency: 2nd choice
period: 4th choice
amplitude: 1st choice
wavelength: 3rd choice
speed: 5th choice
Using the periodic table, determine which element these characteristics MOST LIKELY describe.
Answer options- A(fluorine) (B iodine ) D (oxygen) C (sodium)
where the characteristics ?!
Answer:
Oxygen, fluorine and iodine are diatomic elements. Flourine is more reactive than the other two because it is the closest away to filling its outer layer of electrons and becoming stable like a noble gas.
Explanation:
hope this helps
An injury to the medulla may result in which of these symptoms?
loss of smell
depressed breathing
loss of sight
memory loss
Explain
An injury to the medulla may result in loss of smell and depressed breathing. Options A and B are correct.
What is medulla?The lowest section of your brain is called the medulla oblongata. Because of its placement, it connects your brain and spinal cord, giving it a vital route for nerve messages to and from your body.
It also aids in the regulation of critical functions such as heart rate, respiration, and blood pressure.
A medulla damage can cause a loss of smell as well as slowed breathing.
Hence,options A and B are correct.
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Answer:a and b are correct
Explanation:
if I had to choose 1 of those it’ll probably be a!
NO MFKN LINK
9.The distance something travels in a certain amount of time, such as 45mph, is
(10 Point)
A. Velocity
B. Speed
C. Time
Answer:
The answer is A
Explanation:
Velocity is the rate of change of its position with respect to a frame of reference, and is a function of time.
Select the statement below that best describes how environmental conditions affect an individual’s likelihood of survival and reproduction.
Explain why you chose the answer you did to the question above.
Answer:
I need more information it depends on the conditions.
I chose this answer because different people have different illnesses and that can effect how their bodies respond to the environmental conditions
Answer: The 2nd box from the top
Explanation: I know because I just did this
What is a disadvantage of using nuclear power to produce electricity?
A.
Nuclear waste must be safely stored for many years.
B.
Nuclear fission produces less energy than burning coal or oil.
C.
Nuclear waste must be burned which produces carbon emissions.
D.
Nuclear fission releases more air pollution than burning coal.
Answer:
A
Explanation:
A high diver dives off a platform and hits the water 3.6 seconds later. How high was the platform?
Answer:
A high diver dives off a platform and hits the water 3.6 seconds later. How high was the platformExplanation:
Answer:
33m
Explanation:
How many paired sets of electrons would be found on an electron dot model of sulfur?
A 1
B 2
C 3
Shante makes a diagram to compare the effects of short-term and long-term environmental changes. Which statement should she place in the region marked X? Cause speciation Affect organisms Are caused by plate tectonics Are driven by solar energy changes
No links please or i will say a few things you won't like : )
have u ever wanted to just sleep all day and night
Answer:
yes ofc
Explanation:
A parallel circuit has a 125 Volt battery connected with 3 resistors. R1= 20 Ω, R2= 100 Ω, and R3= 50 Ω. Find the total current of this parallel circuit.
Hint: Find Total Resistance of a parallel circuit first then use Ohms Law I = V/R
10 A
1.5 A
8 A
16 A
Answer:
10A
Explanation:
to calculate r
1/R=1/20+1/100+1/50=2/25
r=25/2=12.5
I=125/12.5=10A
A baseball is thrown at 90 mph from east to west over a distance of 60 ft. What is
true of the ball's motion?
Its speed is 90 mph to the west.
Its acceleration is 30 mph.
Its velocity is 90 mph to the west.
Its acceleration is 150 mph.
Answer:
Its acceleration is 30 mph.
Explanation:
The true of the ball's motion will be that the velocity is 90 mph to the west. Velocity is the vector quantity. Because it shows the direction.
What is acceleration?
Acceleration is defined as the rate of change of the velocity of the body. Its unit is m/sec². It is a vector quantity. It requires both magnitudes and direction to define.
The given data in the problem is
The velocity of baseball is,V= 90 mph
The distance travelled in mile is; d=0.0113636 mile
The time period is obtained as;
[tex]\rm t = \frac{d}{v} \\\\ \rm t = \frac{0.0113636}{90} \\\\ t=1.2 \times 10^{-4} \ hr[/tex]
The acceleration is obtained is 0.00108 mile/hr².
Hence, the true of the ball's motion will be that the velocity is 90 mph to the west.
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What inferences can you make about the melting points of the different substances and the motion of their particles, based on the data?
The wax has the greatest melting point than butter and cheese after the wax the cheese has the greater melting point than butter.
Melting point is the state at which the solid is converted into liquid on application of heat. Wax has greatest force of attraction among the wax particles which increases the melting point of the wax, that means higher temperature is required to break the bonds between the wax atoms. Butter has the lowest melting point, there is weak force of attraction between butter atoms the bonds between them break because of application of very little amount of heat. On application of heat on the cheese initially the cheese cube does not change in shape but become flattened due to application of heat. Hence, the wax has the greatest melting point than butter and cheese after the wax the cheese has the greater melting point than butter.Learn more about melting point:
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Density of iron is 800 kg per cubic meter . calculate the mass of iron contained by a 5 cubic meter of iron block . Also calculate it's relative density..
Answer:
this is your answer look it once.
Answer:
hope it is helpful to you
explanation is in the attachment
No links, i will report any absurd answers. Make it a paragraph please- ill give branliest to the best answer
Which structure contains cells that attach to the molecules we breathe in?
nose
retina
olfactory bulb
sinus cavity
Explain
Answer:
I’m pretty sure it would be the sinus cavity
Explanation:
They are located on the sides of your nose and they help filter and add moisture to any air that is inhaled
The structure contains cells that attach to the molecules we breathe in
d)sinus cavity
What are sinuses?
The sinuses are part of the nose and respiratory system , they connect to your nasal passage in a complex network of air flow and drainage passages
The structure contains cells that attach to the molecules we breathe in
d)sinus cavity
As we breath in air through our nose and mouth , it moves through sinus passage . The sinus also produce mucus that coats and lubricate the nasal passages and the sinuses themselves
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A 3-kg rock falls for 5 sec. What is its speed after falling for 5 sec? Reminder - Acceleration due to gravity, on Earth = 9.8 m/s/s
Please answer asap
The difference in electrical potential energy between two places is called:
a. resistance
b. friction
c. induction
d. voltage
The correct option is, (d) voltage.
The difference in electrical potential energy between two places is called voltage.What is the difference in electrical potential energy between the two places?The external effort required to move a charge in an electric field from one position to another is known as an electric potential difference, or voltage. A test charge with a value of +1 will experience an electric potential difference, which is a shift in potential energy.What is a difference in electric potential energy?The electric potential difference is the difference in electric potential (V) between the final and the initial location when work is done upon a charge to change its potential energy.What is the potential difference between two charges?The word "potential difference" refers to the magnitude of the electrostatic force acting between two charged objects. Depending on the polarity of the objects, a charged body will attempt to travel in one direction if it is placed between two objects with a potential difference.Learn more about electrical potential energy here:
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While at the beach, Lee collected this pile of rocks. How could Lee find out whether the rocks contain the same minerals?

A) Compare their sizes.
B) Compare their shapes.
C) Compare their masses.
D) Compare their colors.
While playing hockey in gym class, Timmy is trying to send a plastic puck across the floorand into the goal. Which of the following best describes the forces acting on the plastic puck as it travels across the floor and into to the goal?
A.electromagnetic and gravity
B.gravity and friction
C.mechanical force and friction
D.magnetism and friction
Answer:
C. mechanical force and friction
Explanation:
Timmy's muscles are striking the puck through the stick. The force from the muscles moves the sick, which hits the puck. (EDIT) In addition, the puck is slowed as it travels across the floor, via friction.
Answer:
gravity and friction
Explanation:
Use the diagram below to answer the questions that follow for 1 point each. Predict the change seen in the balloon in the freezer Explain your prediction Use the equation to provide additional support for your prediction
NO LINK ANSWERS
Answer:
The particle model of matter is one of the most useful scientific models because it describes matter in all three states. Understanding how the particles of matter behave is vital if we hope to understand science!
The model also helps us to understand what happens to the particles when matter changes from one state to another.
The following diagram shows different changes of state, as well as which processes are the reverse of each other. Melting and freezing are the reverse processes of each other and so are evaporation (boiling) and condensation.
Explanation:
Okay, I have three more questions.
1.) When a gas or liquid is heated, it warms, expands, and blank because it is blank dense.
2.) When a gas or liquid is cooled, it becomes blank dense.
3.) As the warm gases and liquids rise and cool gases and liquids sinks, it creates a blank.
An archer shot a 0.07 kg arrow at a target. The arrow accelerated at 4,000 m/s2 to reach a speed of 50.0 m/s as it left the bow. During this acceleration, what was the net force on the arrow?
A) 280 N
B) .0000175 N
C) 57,142 N
D) 3.5 N
The net force which has to be applied on the arrow of 0.07kg to accelerate at the rate of 4000m/s² is 280N. Thus, the correct option is A.
What is Force?
A force is an influence which can be a push or a pull that can change the motion of an object. A force can cause an object with some mass to change the velocity, i.e., results into acceleration. A force is a vector quantity as it has both the magnitude and direction.
Force applied on an object can be calculated by the formula:
f = m × a
where, f = force applied,
m = mass of the object,
a = acceleration of the object
Therefore, the force applied on the arrow is:
f = m × a
m = 0.07kg
a = 4000m/s²
f = 0.07 × 4000
f = 280N
Therefore, the correct option is A.
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Using the periodic table, determine which element these characteristics MOST LIKELY describe.
A(fluorine) (B iodine ) D (oxygen) C (sodium)
Answer: A) F
B) I
C) O
D) Na
Explanation: not sure if this is what ur asking for but those are the symbols
This is written question
No link answers please!!!
Identify the beaker with the LOWEST amount of kinetic energy
Identify the beaker with the HIGHEST amount of kinetic energy
Explain the relationship between kinetic energy and thermal energy
Answer:
The hotter the substance, the more its particles move, and the higher its thermal energy. ... Heat. The heat from a heater. *Let's think about that cup of hot chocolate. ... Some matter changes from solid to liquid to gas as its particles heat, vibrate and separate. ... Boiling a kettle is an example of both thermal and kinetic energy.
Explanation: