a. 4.2 x 10⁻¹³ J
b. 6.3 x 10⁻²⁰ J
c. 7 x 10⁻¹⁸ J
Further explanationRadiation energy is absorbed by photons
The energy in one photon can be formulated as
[tex]\large{\boxed{\bold{E\:=\:h\:.\:f}}}[/tex]
Where
h = Planck's constant (6,626.10⁻³⁴ Js)
f = Frequency of electromagnetic waves
a.
[tex]\tt E=6.626.10^{-34}\times 6.32.10^{20}=4.1876.10^{-13}~J[/tex]
b.
[tex]\tt E=6.626.10^{-34}\times 9.50.10^{13}=6.2947.10^{-20}~J[/tex]
c.
[tex]\tt E=6.626.10^{-34}\times 1.05.10^{16}=6.9573.10^{-18}~J[/tex]
What is the difference between melting and burning a substance? Is mass conserved in either process?
Answer:
First Question:
Melting is a physical process that involves the phase transition of a substance from its solid to its liquid state. Burning, on the other hand, is a chemical process that involves a substance being broken down and changed into different substances. It's still the same substance, though: water.
Second Question:
Mass is therefore never conserved because a little of it turns into energy (or a little energy turns into mass) in every reaction. But mass+energy is always conserved. Energy cannot be created out of anything.
Explanation:
1. A peep with volume 180 cm is placed in a vacuum pump with a pressure of 0.9 atm. If the
pressure is dropped by the pump to 0.030 atm, what will the new volume of the peep be?
P
V
T
Initial
0.9atm
180cm3
Final
0.030atm
Effect
Answer:
V₂ = 5400 cm³
Explanation:
Given data:
Initial volume = 180 cm³
Initial pressure = 0.9 atm
Final pressure = 0.03 atm
Final volume = ?
Solution:
The given problem will be solved through the Boly's law,
"The volume of given amount of gas is inversely proportional to its pressure by keeping the temperature and number of moles constant"
Mathematical expression:
P₁V₁ = P₂V₂
P₁ = Initial pressure
V₁ = initial volume
P₂ = final pressure
V₂ = final volume
Now we will put the values in formula,
P₁V₁ = P₂V₂
0.9 atm × 180 cm³ = 0.030 atm × V₂
V₂ = 162 atm.cm³ / 0.030 atm
V₂ = 5400 cm³
PLEASEEE HELP SCIENCE A cold front forms when cold, dense air moves under warm, less dense air, as shown in the
following illustration. Cooler weather usually follows a cold front. Cold fronts often bring other weather
changes.
if anybody knows these 3 answer plz
Answer:
Skylight is a research, community building, consultation and support unit advancing the science behind education.
When the lava meets the sea, it cools quickly while boiling the ocean into steam.
Explanation:
How am i cool to you
Answer:you are a fantastic person! i love your avatar. And...this gave me extra points so thank you!
What determines the number of valence electrons an atom has?
Answer:
You can find how many valence electrons an atom has by looking at what group the element is in. For example, oxygen is in group 6... so therefore, it has 6 valence electrons.
Please mark me as Brainliest, I need it to move onto the next level.
A football field is 100 m long. If it takes a player to run the field 30 seconds what is
their speed
Answer:
The answer is 3.33 m/sExplanation:
The speed of an object can be found by using the formula
[tex]v = \frac{d}{t} \\ [/tex]
where
d is the distance
t is the time taken
From the question we have
[tex]v = \frac{100}{30} = \frac{10}{3} \\ = 3.333333...[/tex]
We have the final answer as
3.33 m/sHope this helps you
Which term describes the dashed line shown in the graph
Answer:
Where's the graph?
Explanation:
Solar cells can be used to power calculators and cars, and to heat buildings. T or F
Answer:
True
Explanation:
In a home, what would cause air to cool and sink? and what would make that cooler air actually rise again?
Brainliest will be given and anyone who can help me with my psychology exam I’ll give them 100 points
The scientific notation : A. 9.594 x 10⁻³
Further explanationScientific Notation consists of 2 parts
1. the first part: the first digit followed by the decimal point
2. The second part: the power of 10 (the exponents).which shows the number of digits after the decimal point
Multiply scientific notation :
1. multiply coefficients
2. add the exponents.
3. converted to scientific notation.
3.120 x 10⁻⁷ x 3.075 x 10⁴ =
multiply coefficients[tex]\tt 3.120\times 3.075=9.594[/tex]
add the exponents.[tex]\tt 10^{-7}\times 10^4=10^{-7+4}=10^{-3}[/tex]
combine[tex]\tt 9.594\times 10^{-3}[/tex]
HELP!!
How is the Earth's interior characterized? and provide a real-world example
Answer:
FREE POINT!!!!!!!!
Explanation:
Nitrogen boils at -195°C, because it is normally a gas at room temperature. At -250°C, it is a: solid, liquid, gas
Answer:
i think its liquid because they is liquid nitrogen and the gas but i think its liquid
Researchers are studying lichens growing on trees in a forest ecosystem. At the
beginning of the study, the researchers identified twelve lichen species in the forest.
Later, a forest fire happened in the study area. The researchers returned to the area and
found only six lichen species.
Which inference is best supported from the researchers' observations?
Answer:
The answer is C
Explanation:
C
The inference is best supported from the researchers' observations is (D) Certain Lichen species are better adapted to survive forwst fire than others. Hence the correct option is (D).
What is Adaptation ?Adaptation is a dynamic process of Natural selection which helps organisms fit better into their environments and improves their evolutionary success.
The population arrives at it during that process.
The six lichen species that have survived can be inferred to be either genetically evolved to be fire resistant or to recover quickly from an inferno. The other six species that perished, however, weren't prepared for these circumstances.
Therefore, The inference is best supported from the researchers' observations is (D) Certain Lichen species are better adapted to survive forwst fire than others. Hence the correct option is (D).
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Convert 0.05 Mm -> mm
Answer:
To convert any value in millimeters to millimeters, just multiply the value in millimeters by the conversion factor 1. So, 0.05 millimeter times 1 is equal to 0.05 millimeters.
Answer:
0.00005
Explanation:
The smallest of the -2 ions?
Answer:
Ionic radius increases down the group, therefore Li+ ion has the smallest ionicsize out of the three ions.
Which statement best compares pure substances to mixtures?
Pure substances contain small amounts of impurities. Mixtures contain large amounts of
impurities.
Pure substances must be made of two chemical materials. Mixtures can be made of only one
chemical material.
Pure substances are either compounds or elements. Mixtures are homogeneous or
heterogeneous combinations.
Pure substances are liquids dissolved in liquids or gases dissolved in gases. Mixtures are
gases dissolved in liquids or solids dissolved in liquids.
Answer:
pure substances contain small amount of impurities . mixture contain large amounts of impurities
Pure substances are either elements or compounds while mixtures are homogeneous or heterogeneous combinations.
What is Pure substance and mixture?Elements are pure substances as they cannot be broken down into simple substances by any chemical or physical methods as they have only one type of atom in the whole composition.
A pure substance is composed of two or more elements that are chemically combined in a definite proportion. That type of pure substance is called a compound. Water is a pure compound made up of a combination of oxygen and hydrogen.
A mixture is composed of two or more different types of substances which are physically combined. A mixture can separate back into its original components. These types of impure substances are also referred to as mixtures.
A mixture can be either homogeneous or heterogeneous. Cement is a calcium compound solid it is considered a homogeneous mixture while famous gaseous heterogeneous mixes such as cologne and perfume.
Therefore, statement (C) best compares pure substances to mixtures.
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Silver is a white metal and is an excellent conductor of heat and electricity. The density of silver is 10.49 g/cm³. Silver does not react with water, but it does react with nitric acid. Silver tarnishes when exposed to air or light. Which is a physical property of silver?
Describe the development of the periodic table.
Mendeleev's holes have long since been filled in and new elements have been added to the periodic table.
What is periodic table?Periodic table is defined as a list of chemical elements that are ordered in atomic number order, typically in rows, with comparable chemical elements appearing in vertical columns because of their similar atomic structures. The table can be used by scientists to anticipate chemical reactions, study trends in the periodic properties of certain elements, and speculate on the properties of yet-to-be-discovered elements.
The structure for the contemporary periodic table was developed in 1869 by Russian chemist Dmitri Mendeleev, who left spaces for elements that had not yet been discovered. He organized the elements into groups based on their atomic weight, rearranging them if necessary if he found that they did not fit.
Thus, Mendeleev's holes have long since been filled in and new elements have been added to the periodic table.
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Which chemical formula shows a covalent compound?
NaCl
HBr
MgO
CO2
Answer:
CO2
Explanation:
A covalent compound is a compound between 2 nonmetals. For this reason, NaCl and MgO can be eliminated since both contain metals. While neither H nor Br are metals, in HBr H is acting as a metal. CO2 is the only choice containing both nonmetals, with both elements acting like nonmetals as well.
what is the voltmeter reading this time?
Athlete’s foot is a fungus that attacks the area between the toes and sometimes the sole of the foot, causing redness, irritation, and a scaly look to the skin. It may even invade the area under the toenails. The fungus thrives in damp, warm places, such as shower rooms, swimming pools, and gymnasiums.
a.) Mutualism
b.) Commensalism
c.) Parasitism
d.) Predator-Prey
Answer:
Parasitism
Explanation:
a chemical change is a change in the ___ of a substance
4. A gram of salt can be dissolved in 100 ml of water. What factors
affect the solubility?
a. Amount of solute
b. Amount of solvent
c. Size of solute
d. Manner of stirring
Help I going to fell I have to 11:59 help please
It’s amplify Science
These two arguments both answer the question Why
did Patient 23 feel sick during week 3?
Which of these arguments is more convincing?
Explain your thinking below.
Argument One: Patient 23 felt sick during week 3 because
he was infected with the C. jejuni bacteria. From "The Human
Microbiome" article, I know that “this kind of C. jejuni
infection can cause diarrhea, vomiting, and fever-all the
symptoms of food poisoning." These symptoms match the
doctor's note for Patient 23 for week 3. When Patient 23 felt
healthy during week 1, the C. jejuni bacteria was not present
in his gut microbiome. In week 3, when he felt sick, C. jejuni
was present. Therefore, C. jejuni is probably the cause of his
sickness.
Argument Two: Patient 23 felt sick during week 3 because
he was infected with the C. jejuni bacteria. C. jejuni is very bad
for you. He probably ate something spoiled. My sister got
food poisoning once.
Answer:
Explanation:I would put argument 2, because C.jejuni is bad r
What is the molecular formula of water vapour?
Answer:
Water vapor still has the same chemical formula as typical water - H2O - but the water molecules in vapor interact less with one another and are not as structured as they are in water and ice.
Explanation:
A 100mL sample of 0.1MMgCl2(aq) and a 100mL sample of 0.2MNaOH(aq) were combined, and Mg(OH)2(s) precipitated, as shown by the equation above. If the experiment is repeated using solutions of the same molarity, which of the following changes in volume will double the amount of Mg(OH)2(s) produced?
a. Using the same volume of MgCl2(aq) but twice the volume of NaOH(aq)
b. Using twice the volume of MgCl2(aq) but half the volume of NaOH(aq)
c. Using twice the volume of MgCl2(aq) but the same volume of NaOH(aq)
d. Using twice the volume of MgCl2(aq) and twice the volume of NaOH(aq)
Answer:
Using twice the volume of MgCl2(aq)MgCl2(aq) and twice the volume of NaOH(aq)NaOH(aq)
Explanation:
The amount of Mg(OH)2 is doubled when the volume of the reactants is doubled because they still react in the ratio of 2:1.
The reaction between MgCl2 and NaOH occurs as follows;
MgCl2(aq) + 2NaOH(aq) -----> Mg(OH)2(s) + 2NaCl(aq)
We can see that the mole ratio of the reactants is 1:2.
Initial number of moles of MgCl2 = 100/1000 L × 0.1 M = 0.01 moles
Initial number of moles of NaOH = 100/1000 L × 0.2 M = 0.02 moles
If i double the volume of each reactant;
Number of moles of MgCl2 = 200/1000 L × 0.1 M = 0.02 moles
Number of moles of NaOH = 200/1000 L × 0.2 M = 0.04 M
We can see that the amount of Mg(OH)2 is doubled when the volume of the reactants is doubled because they still react in the ratio of 2:1.
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Arrange K, Li, and Cs in order of increasing atomic size please
Answer:
Li,K,Cs
Explanation:
Why is "calcium(II) chloride" an improper name for CaCl2? a.) Because this is not an ionic compound. b.) Because the proper name is "calcium dichloride". c.) Because the calcium ion always has a 2+ charge and the "(II)" is unnecessary. d.) Because chlorine is a diatomic element. e.) Because calcium makes an anion when it makes ionic compounds.
Answer:
c.) Because the calcium ion always has a 2+ charge and the "(II)" is unnecessary.
Explanation:
Why is "calcium(II) chloride" an improper name for CaCl₂?
a.) Because this is not an ionic compound. NO. This is an ionic compound.
b.) Because the proper name is "calcium dichloride". NO. The proper name is calcium chloride.
c.) Because the calcium ion always has a 2+ charge and the "(II)" is unnecessary. YES.
d.) Because chlorine is a diatomic element. NO. This is unrelated to the name of the compound.
e.) Because calcium makes an anion when it makes ionic compounds. NO. Calcium makes a cation with 2+ charge.
Which of the following statements concerning the
melting of ice, which occurs in segment BC, is true?
rections: Use the graph below to answer any questions
t follow
OA. The particle motion decreases.
Heating/Cooling Curve for Water
o
B. The particle motion is unaffected.
o
C. The temperature increases throughout the
phase chang
D
E
100-
Temperature
O D. The temperature stays the same until all the
ice has melted.
B
00+
C
А
Energy Added as Heat
Answer you need an right amout of fecal matter
h
Explanation:f ///////////////////////////////////////////c/v
Answer:
D
Explanation: