Archaeologists use radioactive decay of an isotope of the element carbon. Because it has a fairly short half-life, and is found in anything that was once living.
What is radioactivity?The act of producing radiation spontaneously is known as radioactivity. This is accomplished by an unstable atomic nucleus that want to give up some energy in order to move to a more stable form.
Archaeologists use radioactive decay of an isotope of the element carbon. Because it has a fairly short half-life, and is found in anything that was once living.
Hence, carbon is used the correct answer for the blank.
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Answer:
Answer is carbon
Explanation:
EDGE2023
When light of wavelength 160 nm falls on a gold surface, electrons having a maximum kinetic energy of 2. 66 ev are emitted. Find values for the following
When the light of wavelength is falling on gold surface, the electrons begin to exchange energies.
a)The work function in eV is Φ =5.097 eV.
b) The cut-off wavelength is λ₀ = 243.71 nm
c) The frequency is ν₀ =1.231 × 10¹⁵ Hz
What is work function?The energy needed for a particle to escape and break through the surface.
The kinetic energy of the light emitted is 2.66 eV and wavelength of the light is 160 nm = 160 × 10⁻⁹ m.
a) The work function of the gold for given maximum kinetic energy is
Φ = hc / λ - K.Emax
Substituting 6.626 × 10⁻³⁴ J.s for h, 3 × 10⁸ m/s for c and 2.66 eV for K.Emax, work function will be
Φ =8.16 × 10⁻¹⁹ J
1 eV = 1.6 × 10⁻¹⁹
The work function in eV is Φ =5.097 eV.
b) The cutoff wavelength is related to work function as
λ₀ = hc / Φ
Substitute the corresponding values into the equation, we get the cut off wavelength
λ₀ = 243.71 nm
c) The frequency corresponding to the cut-off wavelength is
ν₀ = c / λ₀
Substitute the corresponding values into the equation, we get the frequency,
ν₀ =1.231 × 10¹⁵ Hz
Therefore, the values for the following are
a)The work function in eV is Φ =5.097 eV.
b) The cut-off wavelength is λ₀ = 243.71 nm
c) The frequency is ν₀ =1.231 × 10¹⁵ Hz
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Rhonda has a solar panel on her roof that transforms light energy into electrical energy. This electrical energy is then transferred to an insulated storage tank in her garage, where it is used to heat water in the tank. Assuming this is a closed system, which of the following best describes the energy transformation in this system?
A.
The majority of the electrical energy produced in the system is destroyed as it is transferred to the water tank.
B.
The amount of heat energy produced is much greater than the amount of electrical energy in the system.
C.
The majority of the light energy that initially enters the system is lost to the air surrounding the water tank.
D.
The amount of light energy that enters the system is equal to the amount of heat energy that is produced.
Option A and C best describes the energy transformation in this system. This electrical energy is then transferred to an insulated storage tank in her garage.
What is the law of conservation of energy?According to the Law of conservation of energy,Energy can not be created nor be destroyed, it can transfer from one to another form.
The total energy is the sum of all the energies present in the system. The potential energy in a system is due to its position in the system.
The following best describes the energy transformation in this system is;
A. The majority of the electrical energy produced in the system is destroyed as it is transferred to the water tank.
C. The majority of the light energy that initially enters the system is lost to the air surrounding the water tank.
Hence, option A and C are correct.
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Answer:
The amount of light energy that enters the system is equal to the amount of heat energy that is produced.
Explanation:
I got it on study island
PLEASE HELP ASAP I WILL GIVE YOU BRAINLEAST (15 POINTS)
*Everything in the universe is made up of matter or energy, including common everyday objects you use.*
Identify some ways that you've used energy today?
explain how that energy was transformed?
Answer:
Today my mom drove the car and when the car was standing it was potential energy but when the car started moving it turned into kinetic energy. Hope it helps.
Explanation:
What happens to the energy of a wave if the amplitude is doubled?
Digital information can be sent through the vacuum if space, but the information must be-. A. below a certain size. B. converted to wave pulses C. encrypted for security reasons. D.sent in only one direction
Digital information can be sent through the vacuum if space, but the information must be converted to wave pulses. The correct option is B.
What is digital information?The digital information consists of data generated by the electrical systems. For examples, computers, screens, scientific calculators or any communication devices.
The electromagnetic waves do not require medium, So, they can travel through vacuum. So, Digital information can be sent through the vacuum or space.
Therefore, the correct option is B.
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who discovered the laws of physics
Answer: Isaac Newton
Explanation: Isaac Newton is popularly remembered as the man who saw an apple fall from a tree, and was inspired to invent the theory of gravity. If you have grappled with elementary physics then you know that he invented calculus and the three laws of motion upon which all of mechanics is based.
Fill a clear glass or resealable plastic bag three-fourths full with water. Place the pencil in the water, and hold it vertically without spilling. Look at the pencil from the side. Describe what you see.
Answer:
The pencil will appear wider and bent
Explanation:
no explanation
conclusions about the elevator
Answer:
the invention of elevators has made a huge change to our society, and created a new revolution on not only allowing people to get to higher floors, but to also decrease the amount of land being used in a city.
describe how the *weight* of a spacecraft would compare between when it was on earth and when it was on the moon.
describe how the *mass* of a spacecraft would compare between when it was on earth and when it was on the moon
Answer:
The mass of a spacecraft is the same on earth as the moon.
W = F = M a the weight is different because the acceleration due to gravity is less on the moon than it is on earth.
On could choose a different mode of acceleration, say a compressed spring, and find that mass of an object does not depend on gravitational attraction. F = M a holds on the moon as well as on earth
A friend frequently misses the morning
school bus. Use the scientific method to
address this problem.
Answer: Heyaa! ~
State of the problem is that your friend routinely misses the school bus.
Explanation:
What are the causes for his missing the school bus:
Not waking early enoughToo long breakfastToo far to the bus stop.Deliberately tries to miss the bus.Hopefully this helps you!
-Matthew ^^
Graph the following data on the graph, then use the graph to determine the half-life of this isotope.
Time (years): 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10.
Mass Remaining (grams): 100, 75, 56, 42, 32, 24, 18, 13, 10, 8, 6.
Answer:
4, 56
Explanation:
Hope this helped!
Answer:
4, 56
Ex................................................................................
URGENT
Give three examples of models that you see every day
Object A has a temperature of 3 T. It comes in contact with Object B, which has a temperature of 2 T. Which of the following is true?(1 point)
Both objects will have the same temperature, larger than T but smaller than 2T.
What is the thermodynamic equilibrium?A system in equilibrium if there is no change in temperature after long time.
Assuming the system of two objects with the temperatures 3T and 2T.
When we put them together, heat transfer from the hotter object to the colder one takes place, until both of them have the same temperature
Also, the object with temperature 3T loses temperature, while the object with temperature 2T increases its temperature,
2T < T < 3T
Thus, both objects will have the same temperature, which is larger than 2T but smaller than 3T.
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Jay has a small object that is very dense.
Which of the following accurately describes
the mass and volume of Jay's object?
Density=
Mass
Volume
A. little mass: large volume
B. mass and volume are equal
C. large mass; little volume
D. little weight; large volume
Answer:
d
Explanation:
dence means closely compacted in substance.
What is the third most abundant gas in the atmosphere.
Answer:
Argon
Explanation:
Argon, an inert gas, is the third most abundant gas in the atmosphere.
A 35-mf capacitor is connected to an ac source with a frequency of 400 hz and a maximum emf of 20 v. The maximum current, in s. I. Units, is:
The value of maximum current for A 35-mf capacitor which is connected to an ac source with a frequency of 400 hz and a maximum emf of 20 v is 1.76 ampere.
What is capacitance of capacitor?The capacitance of a capacitor is the ratio of the electric charge stored inside the capacitance to the potential difference. The value of capacitive reactance can be calculated as,
[tex]X_c=\dfrac{1}{2\pi fC}[/tex]
Here, C is capacity and (f) is the frequency.
A 35-mf capacitor is connected to an AC source with a frequency of 400 hz and a maximum emf of 20 v.
[tex]X_c=\dfrac{1}{2\pi fC}\\X_c=\dfrac{1}{2\pi (35\times10^{-6})(400)}\\\X_c=11.37\rm\; ohm[/tex]
The maximum current flowing is the ratio of maximum emf to the capacitive reactance. Thus, the maximum current is,
[tex]I_{\text{RMS}}=\dfrac{V_{\text{RMS}}}{X_C}\\I_{\text{RMS}}=\dfrac{20}{11.37}\\I_{\text{RMS}}=1.76\rm\; Amp[/tex]
Thus, the value of maximum current for A 35-mf capacitor which is connected to an ac source with a frequency of 400 hz and a maximum emf of 20 v is 1.76 ampere.
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Which of the following are possible ways to rotate the turbine in a generator?
steam
wind
falling water
all of the above
Can someone please answer this, ill give you brainliest Would be very appreciated.
Answer:
Carbonation
Explanation:
Carbonation will increase due to the addition of greenhouse gases in the atmosphere.
Defining carbonation :
When rainwater hits rock it decomposes it or eats it away. This is known as carbonation. This occurs when slightly acidic (carbonic) rain or seawater comes into contact with sedimentary rock, such as limestone or chalk, it causes it to dissolve.
Pictured below is a 34 kg rock sitting on top of a cliff that is 23.6 m above the ground.
To the nearest joule, what is the gravitational potential energy of the rock?
to the nearest joule, what is the gravitational potential energy of the rock
Answer:
7872 J
Explanation:
PE=mgh
PE=34 * 9.81 * 23.6
PE = 7871.5 J ≈ 7872 J
1. What are the main greenhouse gases in the atmosphere? According to Resource Card 1, what is the most abundant greenhouse gas?
Answer:
The bottom three pie graphs show the breakdown for each of three greenhouse gases in comparison to the total. Seventy two percent (72%) of the total greenhouse gases emitted was carbon dioxide, 18% methane and 9% nitrous oxide.
Explanation:
A weight lifter lifts a mass m at constant speed to a height h in time t. How much work is done by the weight lifter?
The total work is done by the weight lifter who lifts a mass m at constant speed to a height h in time t, is (mgh)/t.
What is work done to lift an object?The amount of energy which is required to lift a object at a height is known as the work done of lifting an object.
The work done to lift an object for a time period of t is given as,
[tex]W=\dfrac{mgh}{t}[/tex]
Here, (m) is the mass of the object, (g) is the acceleration due to gravity and (h) is the height.
It is given that a weight lifter lifts a mass m at constant speed to a height h in time t. Thus, the work done by the weight lifter is,
[tex]W=\dfrac{mgh}{t}[/tex]
Hence, the total work is done by the weight lifter who lifts a mass m at constant speed to a height h in time t, is (mgh)/t.
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Can someone help me and give me the right answer
Relative to the movement of the building, a mass damper on the roof of an earthquake resistant building move in the opposite direction. The correct option is C.
What is mass damper?Mass dampers absorbs the kinetic energy of the waves, converting them into the heat energy. This heat energy is dissipated to the hydraulic fluid.
The mass dampers used on roof of the buildings are called as the tuned mass dampers. They are also known as seismic dampers. When seismic wave strikes the building, it vibrates and sways. The kinetic energy of theses waves are absorbed by movement of the mass damper. The kinetic energy is converted to the heat energy which in turn is transmitted to the fluid.
Relative to the movement of the building, a mass damper on the roof of an earthquake resistant building move in the opposite direction.
Thus, the correct option is C.
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What is the relationship between amplitude and wavelength?.
Answer:
The amplitude of a wave is the height of a wave as measured from the highest point on the wave (peak or crest) to the lowest point on the wave (trough). Wavelength refers to the length of a wave from one peak to the next.
Explanation:
) Angelique lands on the trampoline.
She bends her knees and pushes hard against the trampoline.
Complete the sentence.
Choose the best word from the list.
force friction mass weight
Angelique exerts more .............................................................. so she jumps higher
please help asap choose answer from the list
on the graph below, what is the total distance traveled during the recorded time interval? what is the displacement?
The total distance traveled during the recorded time interval would be 5 meters and the displacement of the object would be 5 meters.
What is displacement?Displacement is a vector quantity. This indicates that it has both a direction and a magnitude and that it is visually represented as an arrow that points from the starting position to the ending position.
As given in the problem we have to find out the total distance and the displacement of the object from the graph shown in the problem,
The displacement of the object = Final position - Initial position
=6 - 1
= 5 meters
Thus, The total distance traveled during the recorded time interval would be 5 meters and the displacement of the object would be 5 meters.
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Can someone please answer this, ill give you brainliest Would be very appreciated.
Answer:
molecular structure
Explanation:
Many of the water's unique properties come from its molecular structure.
They have polar covalent bonds. They are closely bonded together due to hydrogen's positive charge and oxygen's negative charged atoms.
Due to this water has melting point of 0 degrees and boiling point of 100 degrees.
Answer:
molecular structure
Explanation:
Many of water's unique properties come from molecular structure.
This is because water is polar and has hydrogen bonds.
True or false. A solvent is the part of a solution that dissolves the solute
Answer:
True
Explanation:
I'm not exactly sure on this , but A solution is made up of two components. Namely,
1. The solvent
2. The solute
The solute has a lower percentage in the solution while the solvent has a higher percentage in the solution so yes, the solvent is used to dissolve the solute
give an example of how the law of inertia is demonstrated (a) for moving objects and (b) for objects at rest
Answer:
Both
Explanation:
Both of them are part of newtons laws of motion
If you pushed a car 25 m and did 60 kJ of work, how much
force did you use?
Given the amount of work done in pushing the car over the given distance, the amount of force applied is 2400 Newtons.
What is work done?Work done is simply defined as the energy transfer that takes place when an object is either pushed or pulled over a certain distance by an external force. It is expressed as;
W = F × d
Where f is force applied and d is distance travelled.
Given that;
Work done W = 60kJ = (60×1000)J = 60000J = 60000kgm²/s²Distance covered d = 25mForce applied F = ?W = F × d
60000kgm²/s² = F × 25m
F = 60000kgm²/s² ÷ 25m
F = 2400kgm/s²
F = 2400N
Given the amount of work done in pushing the car over the given distance, the amount of force applied is 2400 Newtons.
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The base of a hexagonal prism has an apothem measuring 10 inches and an area of 346.41 square inches. the prism is 12 inches tall. what is the approximate lateral area of the prism? round to the nearest whole number. 139 square inches 416 square inches 693 square inches 831 square inches
The approximate lateral area of the prism is determined as 831 square inches.
What is lateral area of the hexagonal prism?
The lateral area of the hexagonal prism is calculated as follows;
LA = PH
where;
P is perimeter of the prismH is heightA = ¹/₂Pa
where;
a is apothem = 10 inchesA is base area = 346.41 in²346.41 = ¹/₂(10)P
346.41 = 5P
P = 346.41/5
P = 69.282 inches
LA = PH
LA = 69.282 x 12
LA = 831.38 in²
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Answer:
it's D on edge
Explanation: