What is the energy of a photon that emits a light of frequency 6. 42 x 1014 Hz?
A. 3. 10 x 10-19 J
B. 4. 25 x 10-19 J
C. 9. 69 x 10-19 J
D. 4. 67 x 10-19 J
Answers
The energy of a photon that emits a light of frequency 6. 42 x 1014 Hz is 4.25 x 10^-19 J.
The energy of a photon can be calculated using the equation:
E=hf,
where E is the energy of the photon, h is Planck's constant (6.626 x 10^-34 J.s), and f is the frequency of the light emitted by the photon.
Plugging in the given frequency of 6.42 x 10^14 Hz into the equation, we get
E=(6.626 x 10^-34 J.s)(6.42 x 10^14 Hz) = 4.25 x 10^-19 J.
Therefore, the correct answer is B i.e, 4.25 x 10^-19 J.
It should be emphasized that a photon's energy is directly linked to its frequency and inversely related to its wavelength. Therefore, light with higher frequency, such as blue light, contains more energy than light with lower frequency, such as red light.
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Related Questions
Jewelry gold is usually mixed with other medals such as silver or platinum. It varies from 10K (10/24 gold) to 18K (18/24 gold). Is jewelry an element, compound or mixture?
Answers
Answer:
Mixture
Explanation:
Jewelry is a Mixture. This is because of the variation in it's composition.
Elements
Elements are pure substances. The fact that jewelry gold is mixed with other medals means it is no longer a single entity, hence not an element.
Compound
Compound are substances that are bonded together with a fixed composition. This means the jewelry gold is not a compound
Jewelry is a Mixture
The following information should be considered:
Jewelry is a Mixture due to the variation in it's composition. Elements are pure substances.The jewelry gold is mixed with other medals so it is not an element. The Compound are substances that are bonded together with a fixed composition. So it is not a compound.Learn more: https://brainly.com/question/25914450?referrer=searchResults
The ___inner core____________ is the hottest layer because it is at the center of the Earth, but pressure from the outer layers makes it solid___________________.
Answers
The earth inner core composed of solid iron is the hottest layer because it is at the center of the Earth, but pressure from the outer layers makes it solid layer.
What is the inner Earth core made of?The Earth's inner core contains even more metal than the outer core. Both are mostly comprised of iron with a little amount of nickel. However, lighter elements like oxygen, carbon, and silicon are also assumed to be present in small amounts in the iron.The deepest geologic stratum of the planet Earth is called the inner core. It is mostly a solid ball with a radius of 1,220 km, which is around 20% of the radius of the Earth or 70% of the radius of the Moon.At the very centre of the planet, under the outer core, lies the inner core, which is the Earth's deepest layer. 5150 km or so below the Earth's surface is where the inner and outer cores officially split.Learn more about Earth's inner core refer to :
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what is atomic mass?????
Answers
Answer:
The atomic mass (ma or m) is the mass of an atom. Although the SI unit of mass is kilogram (symbol: kg), the atomic mass is often expressed in the non-SI unit dalton (symbol: Da, or u) where 1 dalton is defined as 1⁄12 of the mass of a single carbon-12 atom, at rest. The protons and neutrons of the nucleus account for nearly all of the total mass of atoms, with the electrons and nuclear binding energy.
Explanation:
The total number of calcium atoms in the expression 3 cos 2 shown in the equation 3 CaCl 2 +2Na 3 PO 4 Ca(PO 4 ) 2 +6 NaCl is:
Answers
Answer:
\(C\)Explanation:
Here, we want to calculate the percentage composition of the compound formed when oxygen reacts with iron
We have the equation of reaction as follows:
\(4Fe_{(s)}\text{ + }3O_{2(g)}\text{ }\rightarrow\text{ }2Fe_2O_{3(s)}\)The compound formed is Fe2O3
Now, let us get its percentage composition
The molar mass of the compound is 160 g/mol
The atomic mass of iron is 56 amu
The atomic mass of oxygen is 16 amu
Now, let us get the percentage composition:
\(\begin{gathered} \text{Iron = }\frac{2\times56}{160}\text{ }\times\text{ 100 \% = }70\text{ \%} \\ \\ \text{Oxygen = }\frac{3\times16}{160}\text{ = 30\% } \end{gathered}\)The closest here is thus the option C
I need help finding the answer to this question
Answers
Answer:
1.1 for 3d, 0.76 for 16d.
Explanation:
You divide the mass of one nail by the nail size.... I think
For #14 - #17, write the chemical formulas for the compound.
14. Aluminum fluoride
15. Magnesium oxide
16. Vanadium(V) oxide
17. Cobalt(II) sulfide
Answers
Answer:14. Aluminum fluoride
Explanation:yw
how do i find the name of an element
Answers
Answer:
The periodic table will say it underneath the symbol.
Explanation:
I don't know how else to describe it but I hope this helps. :)
So 28 (NI) is nickle bc thats what is says on the bottom left
Question 7 What is the molarity for the following solution: 5. 50 L of 13. 3-MH₂CO (the formaldehyde used to "fix" tissue samples)? (A) 0. 022 mol/L (B) 13. 3 mol/L 2. 2 mol/L D) 0. 0133 mol/L 3 Points
Answers
The molarity of a solution is calculated by dividing the number of moles of solute by the volume of the solution in litres.
Therefore, the molarity of the H₂CO solution is 13.30 mol/L.
In this case, we have 5.50 L of a 13.3 M H₂CO solution. To find the molarity, we need to calculate the number of moles of H₂CO and divide it by the volume of the solution.
The formula weight of H₂CO is 30.03 g/mol. To convert from molarity to moles, we multiply the molarity by the volume in liters:
13.3 mol/L × 5.50 L = 73.15 mol
So we have 73.15 moles of H₂CO in 5.50 L of solution.
Finally, to find the molarity, we divide the number of moles by the volume of the solution:
73.15 mol ÷ 5.50 L = 13.30 mol/L
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describe the structure of an ionic compound
Answers
Answer:
An ionic compound is a giant structure of ions.
Explanation:
As a result of ion attraction, ions form a regular pattern with oppositely charged ions next to each other in an ionic compound. Ions are organized in an ionic network, a giant structure made up of alternating ions.
Help with this please it’s due at 11:59pm tonight
Answers
The molecular structure of the covalent molecules, as well as the electron dot diagrams of hydrogen, ammonia, hydrochloric acid, water, and methane, are found in the attachment.
What are covalent molecules?Covalent molecules are molecules that are formed by covalent bonds between two or more atoms of the same or different elements.
The inorganic elements hydrogen, fluorine, chlorine, water, and ammonia as well as all organic compounds are examples of molecules with covalent connections.
A covalent bond is formed when two atoms exchange one or more pairs of electrons. The two atomic nuclei are concurrently drawing these electrons to them. When the difference between the electronegativities of two atoms is too tiny for an electron transfer to take place to create ions, a covalent bond is formed.
In electron dot diagrams, the valence electrons of an atom are represented by dots that are positioned all around the symbol of the element.
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Which toxic substance is often used to extract gold and results in harmful environmental effects?
a. acid mine drainage
b. carbon dioxide
c. sulfur dioxide
d. cyanide
e. fluoride
Answers
Hurry plzzz I need help
Answers
A carbon nanotube is a carbon molecule that looks like a straw. Carbon nanotubes have diameters of a few nanometers while they can be several millimeters long. Assume that a carbon nanotube of length L is filled with N atoms of a noble gas where N≫1. The system can be considered a onedimensional ideal gas with total energy U. (a) Extract (Find with steps) the Sackur-Tetrode equation for the entropy, S=S(U,L,N) for the onedimensional gas. (b) Extract (Find with steps) an expression for the equation of state P=P(T,L,N) for the onedimensional gas.
Answers
a. Entropy, S = S(U, L, N) for the one-dimensional gas is given by the Sackur-Tetrode equation which is given by:
Sackur-Tetrode equation: S= k[size=0.2]B[/size]Nln[(V/N)((4πmU)/3h²)^(1/2)],where k[size=0.2]B[/size] is the Boltzmann constant, N is the number of particles in the gas, V is the volume of the gas, m is the mass of a single particle, U is the total energy of the gas, and h is the Planck constant.Substituting the values of V and m into the above equation, we get:S= k[size=0.2]B[/size]Nln[(LN/((4πU/3h²)^(1/2)))]b. The equation of state, P= P(T, L, N) for the one-dimensional gas is given by the equation of state for an ideal gas which is given by:
P = (Nk[size=0.2]B[/size]T)/L,where k[size=0.2]B[/size] is the Boltzmann constant, T is the temperature of the gas, N is the number of particles in the gas, and L is the length of the gas.About GasGas is one of the four basic states of matter. Pure gases can be made up of atoms, elemental molecules made up of one type of atom, or compound molecules made up of many kinds of atoms. A mixture of gases will contain as many pure gases as air. Each gas has the same volume at the same temperature and pressure according to Avogadro's law. The volume of 1 mole of gas is 22.4 liters at standard conditions. Here are examples of gaseous objects around you. Air. Smoke. Nitrogen.
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another name for folate is . a. pyridoxamine b. glutamic acid c. dfe d. folic acid e. foliage
Answers
folic Acid
Folic acid, often known as folate, is a water-soluble B vitamin that is necessary for the generation of healthy red blood cells and the regular functioning of the brain system. Folate is present in numerous foods, including leafy green vegetables, legumes, nuts, and grains. Numerous processed goods, including breakfast cereals, breads, and rice, contain it as well. Folic acid is essential for pregnant women because it prevents birth abnormalities. It is also crucial for people of all ages since it helps maintain the health and normal operation of the body's cells. Folic acid is also essential for the production and repair of DNA, as well as the breakdown of specific proteins. Without appropriate folic acid, the body cannot produce red blood cells effectively, which can result in anemia. It is essential to consume adequate amounts of folic acid through diet or supplementation.
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Is there a difference between normal, dry, and oil shampoo?
Please put the URL (the info you got from)
Answers
The main difference between normal, dry, and oil shampoo is that normal shampoo has half amount of oil, dry shampoo has no oil content and oil shampoo has a large amount of oil.
Is dry shampoo better than regular shampoo?Experts say dry shampoo is great once but it shouldn't be a full-time replacement for washing your hair with water. Dry shampoo can be considered to be a hair freshener as compared to a hair cleaner. It does nothing to clean your scalp, which collects dirt.
Dry shampoo is not shampoo at all. The spray absorbs the oil content in your hair, making it less distinguishable. It doesn't remove oil and dirt the same way which is removed by shampoo and water.
So we can conclude that normal, dry, and oil shampoo has a different amount of oil content.
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An unknown substance has a density of 56 g/cm3. Its volume is 3.5 cm.
What is the mass of this unknown substance?
Answers
Answer:
The answer is 196 gExplanation:
The mass of a substance when given the density and volume can be found by using the formula
mass = Density × volume
From the question we have
mass = 56 × 3.5
We have the final answer as
196 gHope this helps you
How many grams of potassium nitrate are produced when 3.0 grams of
potassium phosphate reacts with excess grams of aluminum nitrate?
Answer 4.2 g. *
Answers
Molecules have Question 19 options: A) only potential energy. B) neither kinetic nor potential energy. C) only kinetic energy. D) both potential and kinetic energy.
Answers
Answer:
D
Explanation:
molecules have potential energy and kinetic energy.
Tempreture is defined as the average kinetic energy and internal energy is PE+KE. Pptential energy in particles or molecules is just there position relative to one another. A gas which has seperated particles will have a greater potential energy than a solid/liquid.
Which of the following are characteristics of a temperate broadleaf forest? (Select all that apply.)
They contain mainly coniferous trees.
They experience all four seasons.
They can be found along the Atlantic coast of the United States.
They are very dry and receive little to no rainfall.
Answers
Answer:
They can be found along the Atlantic coast of the United States.
They experience all four seasons.
Explanation:
The characteristic of temperate broadleaf forests are they can be found along the Atlantic coast of the United States and experience all four seasons.
What is temperate broadleaf forest?As the name suggested that temperate broadleaf forests are those forests in which temperature througout the year is moderate and leaf of the tress are broad in shape.
As in that forest temperature is mild but that forest will experience all four seasons.Quality of soil of this forest is rich in minerals.Tress which are mostly present in this forests are oak, maple, beech, hickory, etc which are having broad leaves.They are generally found in central China and eastern North America, means along the Atlantic coast of the United States.Hence they can be found along the Atlantic coast of the United States and experience all four seasons are the characteristics of this forest.
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What property do metals exhibit as a result of having delocalized valence electrons?
A. brittleness
B. flammability
C. low melting points
D. electrical conductivity
Answers
Electrical conductivity is the property of metals is as a result of having delocalized valence electrons. The correct option to this question is D.
DefinitionMetallic bonding explains several features of metals by describing how electrons are delocalized around positively charged nuclei.Due to the electron sea's unrestricted movement and ability to carry charge, the majority of metals make excellent electrical conductors. Electrons may move freely, which is why they conduct electricity in molten ionic compounds, aqueous ionic compounds, and conductive nonmetals like graphite.Conductivity. The rate at which heat or an electric charge can travel through a material is measured by its conductivity. A substance that presents extremely minimal resistance to the transfer of thermal or electric energy is referred to as a conductor. The three types of materials are insulators, semiconductors, and metals.For more information on electrical conductivity kindly visit to
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SECTION B
What is the physical state of water at these temperatures?
125 °C =
-24 °C =
75 °C =
Answers
The physical state of water at the following temperatures are :
125° C = Gaseous state (Steam)-24° C = Solid state (Ice)75° C = Liquid stateAnswer:
The physical state of water at 125 °C will be gas.
The physical state of water at -24 °C will be ice.
The physical state of water at 75 °C will be liquid.
The the physical state of water before zero degree celsius is solid.
At 0 it is solid and liquid both.
From 0 to 100 degree Celsius it is liquid.
At hundred degree it is liquid and gas both.
At 100 and above 100 it is gas..
Rank the compounds NH3, CH4 and PH3 in order of increasing boiling point.
a) NH3 < PH3 < CH4
b) CH4 < NH3 < PH3
c) NH3 < CH4 < PH3
d) CH4 < PH3 < NH3
e) PH3 < NH3 < CH4
Answers
The correct answer is c) NH3 < CH4 < PH3.In this case, NH3, CH4, and PH3 are all nonpolar molecules. However, NH3 and PH3 are polar molecules due to the presence of lone pairs on the nitrogen and phosphorus atoms, respectively.
The boiling point is a measure of the intermolecular forces between molecules. Polar molecules have dipole-dipole interactions, which are stronger than the London dispersion forces in nonpolar molecules like CH4. NH3 has the highest boiling point because it has the strongest dipole-dipole interactions due to its greater polarity compared to PH3. PH3 has the lowest boiling point because it has the weakest dipole-dipole interactions. Therefore, the correct order of increasing boiling point is NH3 < CH4 < PH3.
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How many milliliters of 0. 120 m naoh are required to titrate 50. 0 ml of 0. 0998 m butanoic acid to the equivalence point? the ka of butanoic acid is 1. 5 × 10-5.
Answers
The volume of NaOH required to titrate 50 mL of 0.0998 M butanoic acid to the equivalence point is 41.58 mL
Balanced equationC₄H₈O₂ + NaOH —> C₄H₇O₂Na + H₂O
From the balanced equation above,
The mole ratio of the acid, C₄H₈O₂ (nA) = 1The mole ratio of the base, NaOH (nB) = 1From the question given above, the following data were obtained:
Concentration of base, NaOH (Cb) = 0.12 MConcentration of acid, C₄H₈O₂ (Ca) = 0.0998 MVolume of acid, C₄H₈O₂ (Va) = 50 mL Volume of base, NaOH (Vb) =?CaVa / CbVb = nA / nB
(0.0998 × 50) / (0.12 × Vb) = 1
4.99 / (0.12 × Vb) = 1
Cross multiply
0.12 × Vb = 4.99
Divide both side by 0.12
Vb = 4.99 / 0.12
Vb = 41.58 mL
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what is the Ka of a 0.0592 M solution of hydrofluoric acid (HF) with a pH of 6.90
Answers
Answer:
2.7*10^-13
coefficient= 2.7
exponent= -13
Explanation:
Answer: 2.7 x 10^-13
Explanation:
requires temperatures of millions of degrees K
Answers
which of the following is not one of the body's chemical buffering systems? which of the following is not one of the body's chemical buffering systems? hydrochloride phosphate bicarbonate protein
Answers
Hydrochloride (HCl) is not one of the body's chemical buffering systems. Option A is correct.
The body's primary chemical buffering systems include the bicarbonate buffer system, the phosphate buffer system, and the protein buffer system.
Bicarbonate Buffer System; This system involves the equilibrium between carbon dioxide (CO₂), water (H₂O), and bicarbonate ions (HCO₃⁻) in the blood. It helps regulate the pH of the extracellular fluids, particularly in the bloodstream.
Phosphate Buffer System; This system involves the equilibrium between dihydrogen phosphate ions (H₂PO₄⁻) and hydrogen phosphate ions (HPO₄²⁻) in the intracellular fluids and urine. It plays a role in buffering pH changes in the intracellular environment.
Protein Buffer System; Proteins, such as hemoglobin and albumin, contain amino acids with ionizable groups that can accept or donate protons (H⁺). They act as intracellular and extracellular buffers to help maintain pH balance.
On the other hand, hydrochloride (HCl) is not a specific chemical buffering system within the body. HCl is a strong acid that is produced in the stomach to aid in digestion and does not function as a buffer system.
Hence, A. is the correct option.
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--The given question is incomplete, the complete question is
"Which of the following is not one of the body's chemical buffering systems? A) hydrochloride B) phosphate C) bicarbonate D) protein."--
The body's chemical buffering systems include cell and plasma proteins, hemoglobin, phosphates, bicarbonate ions, and carbonic acid. Hydrochloride is not one of the body's chemical buffering systems.
Explanation:The body's chemical buffering systems include cell and plasma proteins, hemoglobin, phosphates, bicarbonate ions, and carbonic acid. Among the options given, hydrochloride is not one of the body's chemical buffering systems.
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Why are supergiant so bright?
Answers
Because supergiants are so massive, the core temperature gets much hotter than in giants, so supergiants can fuse elements heavier than hydrogen and helium. But to support their tremendous mass, supergiants burn up their fuel much more quickly.
Answer:
because the core tempature gets much hotter.
Explanation:
so supergiants can fuse elements heavier than hydrogen and helium. But to support their tremendous mass, supergiants burn up their fuel much more quickly.
Explain with three or more sentences why dog island has valid information or why the website is a hoax’s
Answers
A chemist wants to make 750mL of a 6M NaOH solution. What mass (in grams) of NaOH will they need?
Answers
Answer:
180 g NaOH
Explanation:
Step #1 : Use the molarity equation to find moles. The volume is needed in liters, so convert the milliliters to liters.
Molarity (M) = moles (mol) / liters (L) ---->
Molarity (M) x liters (L) = moles (mol)
750 mL NaOH 1 L
x ---------------- = 0.75 L NaOH
1,000 mL
(6 M NaOH) x (0.75 L NaOH) = ? mol
= 4.5 mol NaOH
Step #2 : Find the mass using the moles and the molar mass of the solution. The molar mass can be calculated using the values of the elements on the periodic table.
Molar Mass (g/mol) = grams (g) / moles (mol) --->
Molar Mass (g/mol) x moles (mol) = grams (g)
? g/mol = (22.99 g/mol Na) + (15.999 g/mol O) + (1.008 g/mol H)
? g/mol = 39.997 g/mol NaOH
(39.997 g/mol NaOH) x (4.5 mol NaOH) = ? g
= 179.99 g NaOH
= 180 g NaOH (2 sig figs)
= 200 g NaOH (1 sig fig)
When a chemical is transferred to a different container, the new container must be labeled with:____.
Answers
When a chemical is moved to another container, the new container needs to be labeled with any label, have an intuitive interface, and be straightforward to operate.
The chemical container's label All structures owned or occupied by the University of Washington, including laboratories, retail establishments, clinics, and other locations where employees handle, store, and transport chemicals, must have labeling that is both clear and consistent and complies with the Hazard Communication Standard. Downstream users of these compounds must abide by labeling specifications when they transfer chemicals to secondary containers, label chemical waste, label UW-synthesized chemicals, label peroxide-forming chemicals, and label Chemicals of Interest, as per Department of Homeland Security standards. Chemical producers must follow labeling specifications on the original container labels.
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