Each photon will give one electron, thereby the number of photons given each second are [tex]4.46\;\times\;10^{15}[/tex]. The power carried by the electrons is 0.255 mW.
What is a laser?
A laser is a light-emitting device that enables the process of optical amplification to deduce electromagnetic radiations.
The given laser has a power output of 2.15 mW and a wavelength is 413 nm.
The energy of each photon emitted is given as:
[tex]E=h\nu=\dfrac{hc}{\lambda}=\rm \dfrac{(6.63 \;\times\; 10^{-34} m^2 kg s^{-1}) \;\times (3.0 \;\times\; 10^8 m s^{-1})}{413 \;\times\; 10^{-9} m}=4.81 \;\times\;10^{-19}[/tex]
The number of photons ejected at 2.15 mW is given as:
[tex]\rm \dfrac{2.15\;\times\;10^-^3\; J}{4.81\;\times\;10^-^1^9J}=4.46\;\times\;10^1^5 \;photons[/tex]
Each photon will give one electron, thereby the number of photons given each second are [tex]4.46\;\times\;10^{15}[/tex].
With the work function of 2.71 eV, the power carried by the electrons is given as:
[tex]KE_{e}=h\nu-\Phi=\rm 4.81\;\times\;10^{-19} J - 2.71 eV\;\times\; \dfrac{1.60 \;\times 10^{-19} J}{1 eV}=6.34 \;\times 10^{-20}[/tex]
The power carried by all the electrons ejected is given as:
[tex]P_{e}=\rm (4.02\;\times\;10^1^5 s^{-1}) \;\times\; (6.34 \;\times\; 10^{-20} J)=0.255 \;mW[/tex]
The power carried by the electrons is 0.255 mW.
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Why is glass a good insulator? a.the atoms in glass do not hold on tightly to their negatively charged particles. b the atoms in glass do not hold on tightly to their positively charged particles. c the atoms in glass hold on tightly to their negatively charged particles. d the atoms in glass hold on tightly to their positively charged particles.
Glass is known to be a good insulator because atoms in glass hold on tightly to their positively charged particles , Option D is the correct answer.
What is an insulator ?
Insulators are those substances that do not conduct heat or electricity like their conductor counterparts.
Conduction of electric charges is as a result of the free flow of electrons in the atom of the substance.
Hence, a good insulator holds on tightly to its electrons and prevent them from flowing freely to conduct electric charges.
Therefore, Glass is known to be a good insulator because atoms in glass hold on tightly to their positively charged particles.
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B. Atoms in glass hold tightly to their negatively charged particles
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29. Molecule H-F has a polar covalent bond because: (1 point)
a. lonisation energy of fluorine is greater than Hydrogen.
b. Hydrogen is a smaller Atom.
c. Electronegativity of Fluorine is greater than Hydrogen.
d. Fluorine has a greater tendency to pull the shared pair of electrons towards itself
Answer:
D
Explanation:
This question is a little strange. C and D are very similar, but I would pick D.
Fluorine actually has the highest electronegativity of all the elements. This allows it to pull more electrons towards itself. Since electrons have a negative charge, this causes the fluorine end of the molecule to be more negative while the hydrogen is left striped of electrons and has it positively charged necleus exposed. This means that one end of the molecule is positive while the other is negative, which makes this molecule polar. The only reason I would pick D over C is that D addresses the second part of the question about the covalent bond. A covalent bond is simply when two atoms share electrons.
Let me know if this was right and I hope it helps.
What determines whether or not a substance will dissolve?.
If you have 20 grams of carbon-14 and it goes through 2 half lives, how much carbon-14 is left?
Answer:
it would be 25% sorry if I'm wrong
A voltaic cell differs from an electrolytic cell in that in a voltaic cell.
Answer:
they are opposite in function
Explanation:
voltaic cell converts chemical energy to electrical energy through redox reactions i.e reduction-oxidation reaction while the electrolytic cell converts chemical energy to electrical energy.
If a person drinks a lot of water, the water content of their blood will increase.
describe how the water content of their blood is regulated.
Explanation:
Less water is reabsobed into the blood.
if it is a low water blood the blood glucose level are regulated by the liver and pancreas
If an atom is neutral, then the number of electrons is equal to the number of _______________________
Calculate the value of ka for acetylsalicylic acid
The value of Ka for acetylsalicylic acid will be calculated as Ka=(x+a)²/x.
What is Ka?Ka is known by the name of acid dissociation constant and for weak acid HA at equilibrium Ka will be calculated as:
Ka = [H⁺][A⁻] / [HA]
Chemical equation with ICE table for the acetylsalicylic acid will be shown as:
C₉H₈O₄(aq) + H₂O(l) ⇄ C₉H₇O₄(aq) + H₃O⁺(aq)
Initial: x 0 0
Change: -a +a +a
Equilibrium: x-a x+a x+a
So, Ka for acetylsalicylic acid will be calculated by putting values on the above equation as:
Ka = [x+a][x+a] / [x-a]
Value of a is negligible as compared to the value of x of acetylsalicylic acid so the term x-a becomes x and equation will be written as:
Ka = (x+a)² / x
By knowing the all values of concentration we can calculate the value of Ka.
Hence Ka value for acetylsalicylic acid will be calculated by using the formula as Ka = (x+a)² / x.
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is dissolving a physical energy
Answer:
Yes
Explanation:
Dissolving makes what is being dissolved and makes it mix with the water no longer holding its original shape. Dissolving may also change the color or texture of the liquid it is dissolved in. These are all physical changes.
Ethylene, a gas found in nature, is commonly used to ripen bananas and other fruits. which compound is ethylene? 2 c h 2 are single bonded to each other, and both are single bonded to the same o. a skeletal model with a chain beginning with o h, then line segments going up, down, up and ending at another o h. 2 carbons are double-bonded to each other; the pair are single bonded to h above left, above right, below right, and below left. two carbons are triple bonded to each other; each is single bonded to h to the outside.
Ethylene is a compound in which two carbons are double-bonded to each other and bonded to 2 hydrogen atoms.
What is the chemical formula of ethylene?Ethylene has a chemical formula [tex]C_2H_4[/tex].
Thus, the 2 carbon atoms are bonded to one another by a double bond. Each of the carbon atoms then bonds with 2 hydrogen atoms to complete their octet state.
The structure is as below:
[tex]H_2[/tex]-C=C-[tex]H_2[/tex]
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Answer:
its a
Explanation:
trust
The volume of a gas is 605 liters at 27.0°C. The new temperature is -3.0°C. What is the new volume? (Remember to convert temperatures to the Kelvin scale.) L
The volume of a gas is 605 liters at 27.0°C and the new temperature is -3.0°C, so the resultant volume of the sample is 544.53L.
What is the relation between volume and temperature?Relation between the volume and temperature of the sample of gas is represented by the ideal gas equation PV = nRT, and for the question required equation is:
V₁/T₁ = V₂/T₂, where
V₁ & T₁ are the initial volume and temperature of the gas.
V₂ & T₂ are the final volume and temperature of the gas.
On putting values from the question on the above equation and by converting temperature into Kelvin, we get
V₂ = (605)(270.15) / (300.15) = 544.53 L
Hence required volume of the sample is 544.53L.
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A tank is full of water. Find the work w required to pump the water out of the spout. (use 9. 8 for g. ) w = n a = 4 b = 4 c = 12 d = 3
The work w required to pump the water out of the spout will be 705600 joules.
What is work done?Work done is defined as the product of applied force and the distance through which the body is displaced on which the force is applied.
Work against gravity is done on a thin layer of liquid with a width of y. The vertex of the trough serves as the center of our coordinate system.
It is obvious that the cross-section of the triangle has length y at a height y. A thin layer at height y is a rectangular box with a volume of 8 y , and lifting it requires a force equal to;
[tex]\rm F= \rho gV \\\\\rm F= 9.8 \times 10000 \times 8y \triangle y \\\\[/tex]
The work on the layer is;
[tex]\rm W= 78400 y \triangle y [4-y]\\\\\ W= \int\limits^3_0 {x} \, dx \\\\\ W= \int\limits^3_0{78400y[4-y]} \, dx \\\\\ W=705600 \ Joule.[/tex]
Hence, the work w required to pump the water out of the spout will be 705600 joule.
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How much energy is needed to change the temperature of 50g of water by 15°C?
Q=mcΔt
Q=50 x 4.186 x 15
Q = 3139.5 J
What is the ph of a solution with [h3o ] = 2. 3 x 10-4 m
The pH of a solution with [H₃O⁺] = 2.3 × 10⁻⁴M is 3.64 means the solution is acidic in nature.
How do we define pH?pH of any solution is define as the negative logarithm of the concentration of hydronium ion as:
pH = -log[H⁺]
Given that concentration of H₃O⁺ or H⁺ = 2.3 × 10⁻⁴M
On putting values, we get
pH = -log(2.3 × 10⁻⁴)
pH = -(-3.64) = 3.64
Hence required pH value is 3.64.
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The molar mass of hydrogen (H) is 1 g/mol, the molar mass of chlorine (Cl) is 35 g/mol, and the molar mass of zinc (Zn) is 65 g/mol. When 130 grams of zinc react completely in hydrochloric acid (HCl), how much is the total mass of the products
The total mass of the product will be 137 grams.
Stoichiometric calculationsFrom the equation of the reaction:
[tex]Zn + 2HCl --- > ZnCl_2 + H_2[/tex]
Mole of 130 grams of Zn = 130/65 = 2 moles
Equivalent mole of [tex]ZnCl_2[/tex] = 1 mole = 1 x135 = 135 grams
Equivalent mole of [tex]H_2[/tex] = 1 mole = 1 x 2 = 2 grams
Total mass of the products = 135 + 2 = 137 grams.
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It is urgent !!!!
what is the specific heat of a substance that took 5000 j to change 20 k and has a mass or 3 kg?
Answer:
h=5000j
change in temperature=20k
m=3kg
using C=H÷M×Change in temperature
C=5000÷3×20
C=5000÷60
C=83.33jkg-1k-1
For the reaction of sodium bromide with chlorine gas
The reaction of sodium bromide with chlorine gas is Cl₂(aq) + 2Na + 2Br? 2Na + 2Cl⁻ + Br²(aq).
What is sodium bromide?Sodium bromide is an inorganic compound, white, crystalline with high melting point.
The reaction between halogens is redox reaction
Oxidation – 2Br⁻ ? Br₂ + 2e⁻ loss of electron.
Reduction – Cl₂ + 2e⁻ ? 2Cl⁻ gains of electron.
Thus, the correct option is Cl₂(aq) + 2Na + 2Br? 2Na + 2Cl⁻ + Br²(aq).
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Sara wants to see if a new brand of hair dye lasts longer than the brand she currently uses. She puts the new hair dye on the left side of her head and the old brand on her right side. After 2 weeks she observes which side of her head has more gray hair showing through.
a. Independent Variable =
b. Dependent Variable =
c. Constant =
Answer:
a: the hair dye
b: the change in color of her hair
c: the same amount of hair for both dyes and the same amount of dye
Explanation:
What is the vaccine ??
Answer:
a vaccine is a needle they give in your arm.
Explanation:
When an acid and alkali react to form water and salt it is called:.
The reaction of acids with alkalis or bases forming salts is called neutralization reaction. Neutralization reaction remove the acidity or basicity of the substance.
What is neutralization?There are various kinds of reaction namely substitution reactions, displacement reactions, combination reaction, neutralization reactions, oxidation etc.
Neutralization reactions are those where, an acid neutralizes a base or vice versa. The product obtained will be neutral thus having no acidity or basicity as the name suggests.
For instance when HCl reacts with the base NaOH, the salt NaCl is formed which is neutral thus having the pH value of 7. Similarly, Acetic acid and KOH reacts together to form potassium salt of acetic acid or potassium acetate. These are all neutralization reactions.
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What mass of nitrous oxide gas (N2O) is contained in 40.0 L balloon at a pressure of 130.0 kPa and a temperature of 25 °C?
**I NEED ANSWERS STEP BY STEP PLEASE**
The mass of the N₂O in the given question is 92.4g.
What is the moles of N2O in the given conditions?STEP1- Apply the ideal gas equation
PV=nRT
STEP2- Put the given values in the equation
P=130kPa, T=298K, V=40L R=8.31
STEP3- Solve the equation
N=PV/RT,
N=130×40/8.31×298
N=2.1moles
N=mass/molecular mass
mass=2.1×44
mass = 92.4g
Hence, the mass of N₂O is 92.4g.
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What is the temperature of 0.80 mol of a gas stored in a 275 ml cylinder at 175 kpa? use p v equals n r t. and r equals 8.314 startfraction l times kilopascals over moles time k endfraction.. 4.6 k 7.2 k 61 k 96 k
The temperature of the ideal gas is 7.235 K.
Temperature of the ideal gasThe temperature of the ideal gas is calculated as follows;
PV = nRT
T = PV/nR
where;
P is pressure of the gasV is volume of the gasn is number of molesR is ideal gas constant = 8.314 L.kPa/mol.KT = (175 x 0.275) / (0.8 x 8.314)
T = 7.235 K
Thus, the temperature of the ideal gas is 7.235 K.
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Answer:
7.2 k
Explanation:
edge
Which type of chemical reaction is represented by this equation
Answer:
2
Explanation:
2 balances out the equation
A 16. 0g sample of iron was heated from 16oc to 35oc, it absorbed 246. 4j of energy as heat. What is the specific heat of this piece of iron?
Answer: 0.81
Explanation:
A gas has a volume of 29.3 L at 28.8 atm. What will its volume be if the pressure is changed to 16.5 atm?
Answer:
P₁V₁=P₂V₂
29.3 * 28.8 = 16.5* V₂
V₂ = 51.14 L
Set up a ripple tank with a wave generator on one side.
remove the boundary. place a flat piece of plastic or glass on the bottom of one side of the tank so that it is completely
submerged. what happens to the waves when they pass from the deeper water to the shallower water?
when the waves pass from the deeper water to the shallower water its speed will decrease.
What is refraction of wave?Refraction of wave is the change in direction of a wave passing from one medium to another caused by its change in speed.
For example, waves travel faster in deep water than in shallower water.
Thus, we can conclude that when the waves pass from the deeper water to the shallower water its speed will decrease.
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You have a solution of silver nitrate with an unknown concentration. To determine the concentration, you devise a method of adding an excess of calcium metal to 100.0 cm3 of solution and collecting the silver by filtration.
2AgNO3(aq)+Ca(s)→Ca(NO3)2(aq)+2Ag(s)
If 0.201 g of silver was collected, calculate the concentration of the silver nitrate solution in
mol dm−3.
Answer with the numerical value of the concentration to three significant figures, but do not include the units.
The concentration of the silver nitrate solution is 1.86 moles/dm³ .
What do you mean by concentration ?The concentration of a substance is the quantity of solute present in a given quantity of solution.
2AgNO₃(aq)+Ca(s)→Ca(NO₃)₂(aq)+2Ag(s)
0.201 g of Silver = 0.201/107.8 = 0.00186 moles
From the equation we can see that for 2 moles of Silver to form we need 2 moles of silver nitrate .
For 0.00186 moles we will need 0.00186 moles of Silver nitrate
The concentration of the solution can be determined as
Molarity = moles / L of solution = 0.00186 moles/l
or 0.00186 moles/cu.cm = 1.86 moles/dm³
Therefore the concentration of the silver nitrate solution is 1.86 moles/dm³ .
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The world's deserts are typically found at 30°N and 30°S latitudes because of ________. the circulation around the Ferrel cells the circulation around the Hadley cells the circulation around the Polar cells none of the above
Answer: The circulation around the Hadley cells
Explanation:
The world's deserts are typically found at 30°N and 30°S latitudes because of the circulations around the Hadley cells. Thus, the correct option is B.
How does sir circulates around Hadley cells?Within each cell, the air moves in a circular motion. Taking the Hadley cell, the warm air at the equator (0° latitude) rises and then cools down in the upper atmosphere, and then circles back down towards the tropics of around 30° latitude.
As the air leaves equator, it rains away more moisture, becoming denser and slightly cooler in temperature, until it finally dry, sinks, and creates the arid bands where many of the world's famous deserts lie. This giant atmospheric conveyor belt, is called a Hadley cell, brings both the tropical rain forests and deserts.
Therefore, the correct option is B.
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N2 + 3H2 to 2NH3 In a certain reaction you start with 4 moles of nitrogen and 10 moles of hydrogen. how many miles of the excess reactant will be left over
Answer:
Explanation:
We know that for every mole of nitrogen consumed, 3 moles of hydrogen are consumed.
For the nitrogen, this means the reaction can occur 4/1 = 4 times.For the hydrogen, this means the reaction can occur 10/3 = 3.33 times.So, hydrogen is the limiting reactant, and if 10 moles of hydrogen are used, then the reaction will occur 3.33 times.
Hence, this means there is enough nitrogen left for the reaction to occur another 0.67 times, and hence 0.67 moles of nitrogen will be left over.
An increase in carbon dioxide in the atmosphere is associated with an increase in global temperature. Which property of carbon dioxide is responsible for this temperature increase?
A. Carbon dioxide transmits more sunlight than other atmospheric gases.
B. Carbon dioxide efficiently turns sunlight into heat.
C. Carbon dioxide keeps heat in the atmosphere from escaping into space.
D. Carbon dioxide stores solar energy in chemical bonds.
Answer:
Pretty sure its C.
Explanation:
Carbon dioxide is known for trapping heat in the Earth's atmosphere so this makes sense.
Hope this helped!
