Answers
Answer:
A
Explanation:
To calculate questions like this, you need to make use of the equation below:
E = hν
E is the energy, h is Planck's constant, and ν is the frequency.
Also, another important formula you need for this question is the following:
ν = c / λ
ν is the frequency, c is the speed of light, and λ is the wavelength.
Therefore, E = hν = hc/λ.
Also remember to convert nm wavelength to meters.
To answer the question, E = hc/λ = ((6.626*10^-34 J•s)(3*10^8 m/s))/(4.45*10-7 m) = 4.42 • 10^-19 J = A
Related Questions
How many particles are in 0.645g of CaCl2
Answers
Answer:
~ 3.5 x 10^21
Explanation:
Mole weight of Ca Cl2 ( from periodic table ) = ~~ 111 gm
.645 gm / 111 gm / mole X 6.022 x 10^23 =
How much energy is required to 100.0 g of ice at -2oc to water at 84.0oc
Answers
Answer:
A copper cup with a mass of 100.0 g contains 96.0 g of water. Both. the cup and the water are at 13.0OC. If 70.0 g of a substance at 84.0OC is added to the cup, the temperature increases to 20.0OC. If the specific heat capacities of copper and water are exactly 390 and 4180 respectively, find the specific heat capacity of the substance.
Explanation:
hope this helps
How many particles are in 2.5 mol of water, H2O?
Answers
Answer: 1.5×1024 molecules
Look at the following atom:
How many protons does this Beryllium have?
How many neutrons does this Beryllium have?
How many electrons does this Beryllium have?
Answers
Answer:
p= 4
e=4
n=5
Explanation:
Which of the following describes how further studies supported the work done by Ernest Rutherford?
A. Max Planck formulated the Planck's constant.
B. Albert Einstein formulated the energy equation.
C. James Chadwick discovered neutral particles in the nucleus.
D. Joseph Proust stated that each compound has a fixed ratio of elements.
Answers
Answer:
c) James Chadwick discovered neutral particles in the nucleus
Explanation:
James Chadwick discovery of neutral particles in the nucleus best describes the further studies supported the work done by Ernest Rutherford. Hence, option (c) is the correct answer.
What is the molar mass of MgSO4?
Answers
Answer:
120.3676 g/mol
Science!
Bond polarity of Si and H
Answers
Answer:
Si 1.90
H 2.20
Explanation:good luck
2H2O2(aq) → 2H2(l) +O2(g) +196.4 kJ. What is the ∆H for a reaction in which 125 mL of 0.90 M H2O2 is completely decomposed?
Answers
Answer: When completely decomposed it will be -11 kJ
Formula for dinitrogen monoxide
Answers
The formula for dinitrigen monoxide is [tex]\fbox{N2O}[/tex]
It is also called as nitrous oxide .
It is colorless gas
It’s structure is linear.
Answer:
the formula is N₂O
Explanation:
Which is a possible heat capacity for a bomb calorimeter?
A) 11.20 kJ/°C
B) 14.21 kJ/(kg°C)
C) 15.32 kJ/mol
D) 15.75 kJ/g
Answers
What is carbon's number of neutron,proton,atomic number,mass number
Answers
No. of Neutrons: 6
No. of Protons: 6
Atomic number: 6
Mass No: 12.011 u
The u means atomic mass unit.
Answer:
Everything is 6 except for mass number
Explanation:
neutron is 6
proton number is 6
atomic number is 6
mass number is 12.011 atomic mass units
What compound releases chlorine or bromine in the stratosphere, threatening the ozone layer?
Answers
Answer:
Halocarbons.
Explanation:
Atmospheric measurements have clearly corroborated theoretical studies showing that chlorine and bromine released from halocarbons in the stratosphere react with and destroy ozone.
A path along which electric charges flow is called
a?
Answers
Answer:
its an electric circuit
Explanation:
is a pathway in which current flows through.
Look at the images below. Which model is the correct organization of an atomic model of an element?
A
B
C
???
Answers
Answer:
in this model is the correct organization of an atomic model of an element is C
how the surface of the early Earth and its atmosphere have changed to
form the surface of the Earth and its atmosphere today,
Answers
Answer:
As Earth cooled, an atmosphere formed mainly from gases spewed from volcanoes.
Explanation:
Use the name to write the formula for the following ionic compound: scandium (III) hydroxide
Use the name to write the formula for the following ionic compound: titanium (IV) cyanide
Answers
Answer:
.
Explanation:
.
Convert 34.0 mm to inches. Please use dimensional analysis, I know the answer is 1.34in I just don’t know how to get there.
Answers
[tex]34.0mm\ x\ \frac{cm}{10mm}\ x\ \frac{in}{2.54cm}[/tex]
put your equation so that your units cancel. The 'mm' will cancel with each other which will get you 'cm' and then the 'cm' will cancel with each other which will get you 'in'.
34.0 millimeters converted to inches would be 1.3385 inches.
What is a unit of measurement?A unit of measurement is a specified magnitude of a quantity that is established and used as a standard for measuring other quantities of the same kind. It is determined by convention or regulation.
Any additional quantity of that type can be stated as a multiple of the measurement unit.
Length is one of the most commonly used measurement parameters.
As given in the problem statement we have to convert Convert 34.0 mm to inches by using the dimensional analysis,
As we know that millimeters and inches, both are units of length,
1 millimeter = 0.0393701 inches
34.0 millimeter = 34.0× 0.0393701 inches
= 1.3385 inches
34.0 millimeters converted to inches would be 1.3385 inches.
Thus, 34.0 millimeters converted to inches would be 1.3385 inches.
To learn more about the unit of measurement here, refer to the link;
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I will mark brainliest
Answers
Answer:
a b c are correct and rest of other are incorrect
draw a condensed structure of each of the following
1. 1,2,-propanediol
2. Ethyl methyl ether
3. Dichloromethane
Answers
The condensed structure of given compounds are shown in the below image.
What is functional group?Functional group is the specific group which is present in an organic compound gives information about the properties of that compound.
In 1,2-propanediol compound hydroxyl functional group is present on the 1st and 2nd position.In Ethyl methyl ether, ether functional group is present.In Dichloromethane, two atoms of chlorine groups are present.Hence, structure of the given compounds are shown in the below image.
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Wetlands are able to remove nutrients and chemicals from water as the water flows through the area. A developer is planning to destroy most of the wetlands near a bay. In three to five sentences, explain how destroying the wetlands would impact the bay’s water quality and ecosystem.
Answers
hope this helps
Answer:
Wetlands are from being useless, disease-ridden places, wetlands provide values that no other ecosystem can. These include natural water quality improvement, flood protection, shoreline erosion control, opportunities for recreation and aesthetic appreciation and natural products for our use at no cost. Removal of the wetlands can result in fish disease, dominance of acid-tolerant species, contamination of groundwater, reduction in agricultural productivity and damage to infrastructure through corrosion. The loss of the wetlands introduces invasive species, either intentionally or unintentionally, these species can put pressure on native plants and eventually push them out of their native habitat.
Wetlands are from being useless, disease-ridden places, wetlands provide values that no other ecosystem can. These include natural water quality improvement, flood protection, shoreline erosion control, opportunities for recreation and aesthetic appreciation, and natural products for our use at no cost.
Removal of the wetlands can result in fish disease, the dominance of acid-tolerant species, contamination of groundwater, reduction in agricultural productivity, and damage to infrastructure through corrosion.
How are the wetlands being destroyed?
In the last three decades alone, nearly one-third of natural wetlands have been lost to urbanization, agriculture expansion, and pollution. The loss of wetlands in urban areas has been more rapid.
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How would one convert 15 seconds to hours?
Answers
Answer:
A
Explanation:
15 sec * 1 hr/3600 sec (note how 'sec' cancels out and you are left with 'hour' in your answer) = 15/3600 hour
Answer:
answer d
Explanation:
1. Which creates a potential difference in an electric circuit
a voltage source
electric charges
a current source
a difference in height
Plese help me I need the answer right now
Answers
Answer:
voltage source
Explanation:
establishes an electric potential difference across the two ends of the external circuit and thus causes the charge to flow. The voltage source is the numerical value of this electric potential difference.
Br2 + NaCl → NaBr + Cl2
Answers
Answer:
NaBr is a reducing agent, Cl 2 is an oxidizing agent. ; Greenish-yellow gas with a pungent, irritating odor. [Note: Shipped as a liquefied compressed gas.]
Explanation:hope its help
what is the correct answer for box c?
yields
products
subscript
coefficient
reactants
Answers
Which of these is a benefit of nuclear fusion?
A. It creates lower temperatures than nuclear fission reactions.
B. There is a lower risk of runaway chain reactions. C. Containment is easier for nuclear fusion.
D. It is less technically challenging than nuclear fission reactions.
Answers
Answer:
B. There is a lower risk of runaway chain reactions.
Answer:
b
explanation:
When would a transformation of chemical energy to electrical energy occur?(1 point)
when the current becomes zero
when a reaction produces the same products
when there is chemical reaction between metals and nonmetals
\
when electrons stop moving between atoms
Answers
A transformation of chemical energy to electrical energy occurs when there is a chemical reaction between metals and nonmetals.
What is electrical energy?The movement of electrons from one atom to another is what results in electrical energy.
A battery is a device that converts chemical energy contained within its active materials directly into electric energy by means of an electrochemical oxidation-reduction (redox) reaction. This type of reaction involves the transfer of electrons from one material to another via an electric circuit.
Hence, option C is correct.
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1. write the formula for the following ionic compound: Calcium Carbonate
Answers
Answer:
CaCO3
Explanation:
The molecule is formed by the calcium cation Ca+2 and the carbonate anion CO3−2.
PLEASE HURRY!!!!!!
1. Good health is dependent upon…
Proper food
Exercise
Rest
All of the above
2. Which of the following has the highest tetanus potential?
A cut by barbed wire at a dairy farm
The puncture of a kitchen knife
An infesting by ticks
The bite of a wild animal
3. (Select all that apply) The three general requirements for resisting disease are:
Exercising
Eating food high in calories
Getting plenty of rest
Eating food that will give you proper nutrition
Taking lots of vitamins
4. Which areas have the fastest population growth?
Agriculture
Suburban
Rural
Cities
5. Every nation has something to develop for the world’s benefit.
True
False
6. Hypothermia can be prevented by proper planning.
True
False
7. Not all land on Earth is currently habitable; ________________.
Therefore, there is not enough land left to inhabit.
Therefore, there is not enough land left to support the growing population
Therefore; there is not enough land left to farm
But, there still remains a vast amount of land to e inhabited all over the Earth
8. Tetanus is sometimes referred to as “lockjaw”.
True
False
9. (Select all that apply) The whooping cough and measles can be prevented by:
Washing hands
Mosquito netting
Sharing eating utensils
Checking for ticks
Vaccination
10. Rabies, typhus and malaria are…
Transmitted by animal bites
Disease which have been eradicated
All untreatable
Caused by viruses
11. Which of the following diseases is caused by a virus?
Malaria
Athlete's foot
Smallpox
Cholera
12. The two internal mechanisms that fight disease include white blood cells and _______.
Antibodies
Vaccines
THANK YOU FOR THE ANSWERS AND PLEASE HURRY! AMEN AND BLESS YOUR SOUL AND HEART!!!!
Answers
Answer:
1) d. all of the above
2) a. cut from a barbed wire at a dairy farm
3) check 3, 4, 5
4) b. suburban areas
5) true
6) is true
7) d. "but..."
8) true
9) check 1, 2, 5
10) a. animal bites
11) c. smallpox
12. antibodies
Which statement correctly defines digestion
1.digestion is mixing food with Silva, which is when Mechanical digestion starts.
2.digestion is chewing food, which is a means of chemical digestion.
3.digestion is a reversible process due to mechanical digestion.
4.digestion is the process of breaking down food into smaller molecules
Answers
Answer: 4
Explanation: digestion is the process of breaking down food by mechanical and enzymatic action in the alimentary canal into substances that can be used by the body.
Answer:
4.digestion is the process of breaking down food into smaller molecules
Explanation:
2Na + 2H20 - 2NaOH + H2
→
For the reaction shown here, predict the number of moles of both products, sodium hydroxide, and hydrogen gas, when ten moles of
sodium and ten moles of water fully react
A
B)
Ten moles of sodium hydroxide and ten moles of hydrogen gas will be
produced
Ten moles of sodium hydroxide and five moles of hydrogen gas will be
produced
Five moles of sodium hydroxide and ten moles of hydrogen gas will be
produced
moride and five moles of hydrogen gas will be
Answers
Answer: B) Ten moles of sodium hydroxide and five moles of hydrogen gas will be produced
Explanation: Got it right on USATestPrep
