A. λ = 3 m
B. E = 1.9878 x 10⁻³³ J
C. Total energy : 1.9878 x 10⁻²⁰ J
Further explanationThe photoelectric effect is an electron coming out of a metal because of electromagnetic radiation
One type of electromagnetic radiation is light
Radiation 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
f = c / λ
c = speed of light
= 3.10⁸
λ = wavelength
A. wavelength
[tex]\tt \lambda=\dfrac{c}{f}\\\\\lambda=\dfrac{3.10^8}{1.10^8~Hz}=3~m[/tex]
B. energy of one photon
[tex]\tt E=h\times f\\\\E=6.626\times 10^{-34}\times 3=1.9878\times 10^{-33}~J[/tex]
C. Total energy
[tex]\tt 1.9878\times 10^{-33}\times 10^{18}=1.9878\times 10^{-20}[/tex]
what are all of the man made elements
Answer:
technetium,promethium,polonium.and astatine
Explanation:
How many molecules are in 23.45 moles of oxygen (O2)?
There are two compounds of gold and chlorine. In one compound, there is 15.39 g of gold for every 2.77 g of chlorine. In the other compound, there is 7.74 g of gold for every 4.18 g of chlorine.
Find the ratio of masses of gold in the two compounds (give in 'y:x' format)
The answer is 3:1 so whoever this helps
Answer:
The ratio of the masses of gold in the two compounds = 3 : 1
Explanation:
In compound 1:
15.39 g of gold combines with 2.77 g of chlorine
mass of gold that will combine with 1 g of chlorine = 15.39/2.77 = 5.55 g
In compound 2:
7.74 g of gold combines with 4.18 g of chlorine
mass of gold that will combine with 1 g of chlorine = 7.74/4.18 = 1.8 g
Ratio of gold in the that combines with 1 g of chlorine in the two compounds is given as
5.55/1.85 = 3
Therefore, the ratio of the masses of gold in the two compounds = 3 : 1
Can any kind soul help me ASAP
Answer:
in my opinion its going to be B because the moles of experiment I are more than moles of experiment II
What are derived units? Give an example
What happens when the chemicals inside an instant cold pack mix together
A.the mixture inside the pack gives off coldness
B.the mixture generates static electricity
C.the mixture absorbs thermal energy from the surroundings
D.the mixture releases thermal energy into the surroundings.
Answer:
the answer is C
Explanation:
there is no such thing as COLD exept absolute ZERO. anything that feels COLD, perse, is just tranfering your thermal energy into it, since it is lacking that energy
When the chemicals inside an instant cold pack mix together then the mixture absorbs thermal energy from the surroundings.
How heat is flow?Heat always flow from hot body to cold body in order to maintain the equilibrium between two bodies.
So when the chemicals inside an instant cold pack mix together then they will absorbs heat in the form of thermal energy from the surronding as they are in cool temperature and will not able to give off heat.
Hence absorption of thermal energy from the surrounding takes place.
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At room temperature(20°C), water is a:
solid
liquid
gas
Answer:
Solid
Explanation:
At room temperature(20°C), water is a:
Why is so much energy produced through fusion and fission reactions?
Answer:
there is a ton of heat being produced
Explanation:
more heat more energy
When calcium carbonate is heated ,two new substances, calcium oxide and carbon dioxide are formed a)write a word equation for the above chemical reaction b)is calcium carbonate an element or a compound ?Explain
Answer:
Explanation:
When calcium carbonate is heated the new substances formed will be Calcium oxide and carbon dioxide
(a)
[tex]CaCO3 + heat[/tex]→[tex]CaO+ CO2[/tex]
[tex]Calcium carbonate + heat[/tex]→[tex]Calcium oxide +Carbon dioxide[/tex]
(b)
Elements are pure substances made up of the same atoms such as Ca, C, etc.
Compound are formed when two or more different types of elements are bonded together. like Calcium carbonate in this case
hence, [tex]CaCO3[/tex] is a compound
What is a change in the environment outside of the organism
Scientists can identify an element by looking at the structure of a single
Answer:enzyme
Did i help you if so leave a thanks if not...than i will better try to explain the anwser or look into it a bit more to get the correct one.
Virtual Classifying Elements on the Period Name the three general categories into which the elements are divided. 3
Answer:
kgtπ橆§π©gu6gt7
Explanation:
help please thank u!!!
If a 200 g sample of Radon-220 has a half-life of 55 seconds. How much material is left after
220 seconds?
A 12.5 g
B) 25 g
c) 55 g
D) 100 g
The answer is B 12.5g
Once atoms have achieved a full outer shell they have the electron configuration of what family?
will mark brainliest
Answer:
At some point in your chemistry education, you may have been introduced to the song “The Elements,” in which Tom Lehrer does a rapid-fire musical rendition of all the elements' names. Like me, you may even have been offered the opportunity to memorize this song for extra credit. If so, it’s possible that you still remember the names of all the elements, which is an impressive feat—not to mention a fun trick to pull out at parties.
Explanation:
Answer:
atoms tend to achieve the electron configuration of a noble gas which is a full outer level of 8 electrons
Which of the following is the best example of solar energy being converted into chemical energy?
Can someone help me pleaseeeeee!!!!
Helppp plzzz
What can be accurately said about
Earth's continents?
Help me please will give brainliest!!!
Answer:
Element A and element D
Please make me brainliest!!
Mari wonders why some parts of the hoodoo seem to be wearing away faster than others. Which factor causes this to happen? *
Some parts of the hoodoo seem to be wearing away faster than others as earth material produced by erosion; small, solid particles of matter derived from rocks or perhaps the remains of organisms.
What is hoodoo ?A hoodoo is indeed a tall, thin rock spire created by erosion. It is also known as a tent stone, fairy chimneys, and earth pyramid. Typically, hoodoos are made of very brittle rock that is covered in harder, less brittle stone that shields each column first from weather.
Hoodoos can have varying colors over the course of their height due to minerals deposited within various types of rock. Some parts of the hoodoo seem to be wearing away faster than others as earth material produced by erosion; small, solid particles of matter derived from rocks or perhaps the remains of organisms.
Therefore, some parts of the hoodoo seem to be wearing away faster than others as earth material produced by erosion; small, solid particles of matter derived from rocks or perhaps the remains of organisms.
To know more about rock, here:
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A nuclear fission reaction produces more energy than a nuclear fusion reaction.
True or false
Answer:
true
Explanation:
chemical properties can be used to
Answer:Chemical properties can be contrasted with physical
Explanation:
_____ is a complex carbohydrate used to store
energy in animals.
Answer:
Glycogen
Explanation:
If we want to know how many neutrons an element has we:
a. look at Period Number ( row)
b. subtract Atomic Number from Atomic Mass
c. look at Atomic Mass (below element symbol)
d. look at Atomic Number (above element symbol)
Answer: B
Explanation: I don’t really know how to explain this because it’s just something my teacher told me and it just stuck in my head
What is precipitation?
the sweat from our bodies on hot days
the gas that we use in furnaces and ovens
any form of water that falls from the sky
warm rain, but not cold snow or sleet
Answer:
C!
Explanation:
In meteorology, precipitation is any product of the condensation of atmospheric water vapor that falls under gravity from clouds. The main forms of precipitation include drizzle, rain, sleet, snow, ice pellets, graupel and hail.
Answer:Precipitation is water released from clouds in the form of rain, freezing rain, sleet, snow, or hail. It is the primary connection in the water cycle that provides for the delivery of atmospheric water to the Earth. Most precipitation falls as rain. Precipitation isn't always in the form of warm liquid. It also includes snow ,sleet ,hail ,and such.
Did this help? If so please leave a thanks! (:
White powder lab analysis
The U.S. Military provides personnel on deployment with fuel bars to heat up their meals. A fuel bar provides 380.0 kJ of energy, and 73% of that energy can be transferred to food. How many ounces of water could be heated by one fuel bar to brew coffee in the field? The initial temperature of the water is 16.0°C and it needs to be heated to boiling at 100.0°C.
Answer:
Explanation:
380 x 10³ J
73% of 380 x 10³ = 277.4 x 10³ J
mass of water = m gram
heat used to boil water = m x 4.2 x ( 100 - 16 )
= 352.8 m = 277.4 x 10³
m = 786.3 g
1 gram = .0352 ounce
786.3 gram = 786.3 x .0352 ounce
= 27.68 ounce .
1) All atoms of the same element must contain the same: a) mass number b) protons c) neutrons d) compounds
Answer:
all atoms of the same element mist contain the same number of. protons
Explanation:
For isotopes, only the number of neutrons has been changed. examples are carbon-12 carbon-13 and carbon-14, because none of these situations change the number or protons, the atomic number stays the same regardless
Read the statement and identify whether it is a Chemical Change, Physical Change, or Both. Answer the following questions Chemical (A), Physical (B) or Both (C).
Eating and digesting cheese pizza.
Explanation:
Eating and digesting cheese pizza is a Chemical Change because it is an irreversible reaction. It can't be undone.
WILL MARK BRAINLIEST
Predict the charge each of the following atoms would have as an ion-if more than one charge is possible,
include each different charge
A. Cl
B. Na
C. Mg
D. O
E. Al
F. N
G. Be
H. Ne
Explanation:
A. Cl⁻
B. Na⁺
C. Mg⁺⁺ Or Mg²⁺
D. O²⁻
E. Al³⁺
F. N³⁻
G. Be²⁺
H. Ne (No charge because it's an noble element)
A student has a sugar cube and a glass of tea.
What are two ways the student can increase the speed at which the sugar
cube dissolves in the glass of tea?
O A. Add more sugar cubes to the tea.
B. Add ice cubes to the glass of tea.
C. Stir the tea after adding the sugar cube.
D. Break the sugar cube into smaller pinces.
Answer:
D or C Because C speads up the process while D makes the water have to process less But I say C
Explanation:
could I get brainlists plz
Answer: C & D
Explanation: hope this helps