plz help me with this one question
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Answer:

The wavelength of the incoming photon is 172.8 nm

Explanation:

The wavelength of the incoming photon can be calculated with the photoelectric equation:

[tex] KE = h\frac{c}{\lambda_{p}} - \phi [/tex]   (1)

Where:

KE: is the kinetic energy of the electron

h: is Planck's constant = 6.62x10⁻³⁴ J.s  

c: is the speed of light = 3.00x10⁸ m/s

[tex]\lambda_{p}[/tex]: is the wavelength of the photon =?  

Φ: is the work function of the surface (Iron) = 4.5 eV        

The kinetic energy of the electron is given by:

[tex] KE = \frac{p^{2}}{2m} = \frac{(\frac{h}{\lambda_{e}})^{2}}{2m} [/tex]  (2)

Where:  

p: is the linear momentum = h/λ

m: is the electron's mass = 9.1x10⁻³¹ kg

[tex]\lambda_{e}[/tex]: is the wavelength of the electron = 0.75 nm = 0.75x10⁻⁹ m

Hence, the wavelength of the photon is:

[tex] \frac{(\frac{h}{\lambda_{e}})^{2}}{2m} = h\frac{c}{\lambda_{p}} - \phi [/tex]

[tex]\lambda_{p} = \frac{hc}{\frac{h^{2}}{2m\lambda_{e}^{2}} + \phi} = \frac{6.62 \cdot 10^{-34} J.s*3.00\cdot 10^{8} m/s}{\frac{(6.62 \cdot 10^{-34} J.s)^{2}}{2*9.1 \cdot 10^{-31} kg*(0.75 \cdot 10^{-9} m)^{2}} + 4.5 eV*\frac{1.602 \cdot 10^{-19} J}{1 eV}} = 1.728 \cdot 10^{-7} m = 172.8 nm[/tex]      

Therefore, the wavelength of the incoming photon is 172.8 nm.

I hope it helps you!        

Answer:

64g of [tex]\bold{CH_{3}OH}\dashrightarrow[/tex]44.8L

vapour density of [tex]CH_{3}3OH=\frac{mass}{volume}[/tex] of [tex]\bold{CH_{3}OH}[/tex]

=64/44.8=10/7=1.43 g/l

Vapour density of [tex]\bold{CH_{3}OH}[/tex]=1.43g/l

64g of [tex]\bold{CH_{3}OH => 44.8L }[/tex]

vapour density of [tex]\small{\sf{CH_{3}3OH=\frac{mass}{volume} of } \bold{CH_{3}OH}}[/tex]

=64/44.8=10/7=1.43 g/l

Vapour density of [tex]\bold{CH_{3}OH = 1.43 g/L}[/tex]

Answer:

A

Explanation:

Fe up to Fe+3

In the given reaction, Fe is a reducing agent. Therefore, option (A) is correct.

A substance in a redox reaction that donates its electrons to another substance and gets oxidized to a higher valency is called a reducing agent.

A reducing agent can be explained as one of the reactants of a redox reaction that can reduce the other reactant of the chemical reaction by donating its electrons.

If the reducing agent will not provide its electrons to other substances in a chemical reaction, then the reduction cannot take place. The given chemical reaction is:

Fe  +  AgNO₃  →   Fe(NO₃)₃  +  Ag

In the above reaction, the Fe is in the zero oxidation state and changes into Fe³⁺ in  Fe(NO₃)₃ after the chemical reaction So Fe losses its electron and gets oxidized. Therefore, Fe is a reducing agent in this reaction.

Learn more about reducing agent, here:

brainly.com/question/2890416

#SPJ2

Answer:

Phase C - Liquid State

Phase E - Gaseous State

Explanation:

Usually, in phases of water, we have the following;

When temperature is less than zero, it is said to be in its solid phase as ice.

When temperature is between 0 to 100, we can say it is in the liquid phase as water.

When temperature is above 100°C, It is said to be in the gaseous phase as vapour.

From the diagram;

Phase C is the only liquid state because it falls between temperature of 0°C and 100°

Also, only phase E is in the gaseous phase because the temperature is above 100°C.

Answer:

A.

Iron, Fe

explanation:

Iron reduces silver nitrate to silver.

Answer:

agno3

Explanation:

just took the quiz

Explanation:

Kẽm tác dụng với axit clorua ( nhiệt độ ) thì sẽ tạo ra Kẽm II clorua và có khí Hidro bay lên

Answer:

The main different of double salt and complex salt is that a double salt is a combination of two salt compounds whereas a complex salt is a molecular structure that is composed of one or more complex ions.

Answer:

Dekameter

Explanation:

Answer:

I hope this helps

Answer:

Coppell zinc,ironic bond

Explanation:

lt will give away two zinc atoms

Answer:

I will go with Sodium chlorine NaCl

Answer:

1 mol of O2

Explanation:

n = m/ M

n = 32/ ( 2× 15.999)

n= 1 mol of O2

Answer:

An object can store energy as the result of its position. For example, the heavy ball of a demolition machine is storing energy when it is held at an elevated position. This stored energy of position is referred to as potential energy. Similarly, a drawn bow is able to store energy as the result of its position

Answer:

you can see the attached file is scanned the same level of detail of the heart the heart and I am a little bit of an emergency you can see it on the heart the tree is the best of luck for tomorrow be in a few days and times are available in a while back and forth to be a good idea and latitude longitude of

Answer:

C. Fusion reactions require a lot of heat and pressure

Explanation:

A Nuclear fusion doesn't occur naturally on Earth because it requires temperatures far higher than Earth temperatures. Nuclear fusion takes place only at extremely high temperatures. That's because a great deal of energy is needed to overcome the force of repulsion between the positively charged nuclei.

Explanation:

P_H

and

li_n

hope it helps

Answer: i Choose the sun

because it has mass

Explanation: matter is anything that has mass and occupies space / Volume

and the sun has mass though it is not a solid one, and is made up of matter

HOPE THIS HELPSS!!!!

Answer:

when it comes to adding or subtracting numbers, his final answer should have the same number of decimal places as the least precise value.

For example if you add 2 numbers; 10.443 + 3.5 , 10.443 has 3 decimal places and 3.5 has only one decimal place.

Therefore 3.5 is the less precise value.

So when adding these 2 values the final answer should have only one decimal place.

after adding we get 13.943 but it can have upto one decimal place. then the second decimal place is less than 5 so the answer should be rounded off to 13.9.

the answer is the same number of decimal places as the least precise value

Explanation:

I think this is the answer I'm not sure

Answer: the same number of decimal places as the least precise value

Explanation:

Answer:

Gold will have more mass

Explanation:

Mass = volume×density

mass of silver = 5×10.5= 52.5

mass of gold = 5×19.3 = 96.5

Gold has more mass

Answer:

copper carbonate reaction is known as the termed of thermal decomposition

reaction

Here, we have been given the the amount of helium to be 52 amu.

Thus,

$ \red{\leadsto}$ Hence, the number of atoms will be 13 atoms.

[tex] \\ [/tex]

Answer:

Ron and Hermoine

Explanation:

They always fought over petty things, but at the end, they did end up together!

(Answer for your question about love and friendship being a central theme in Harry Potter and the Philosopher's stone)

*ALSO, MY ANSWER MIGHT BE WRONG* so be sure to use a pencil just in case!

Answer:

C6H12

Explanation:

Step 1: Find the molar mass of carbon dioxide and water

MH2O = 2(1.008) + 16.00 = 1.802x10^1 g/mol

MCO2 = 12.01 + 2(16.00) = 4.401x10^1 g/mol

Step 2: Calculate the moles of the products

nH2O = 108g / 1.802x10^1 g/mol = 5.99 or about 6

nCO2 = 264g/ 4.401x10^1 g/mol = 5.99 or about 6

Step 3: Enter moles of carbon dioxide and water into the balanced equation

CxH2x + O2 = 6CO2 + 6H2O

Step 4: Balance

We see how there is six carbon dioxide on the right side which means there are six carbons in the equation.

This means x is equal to 6 in our equation.

If you plug the information into the equation you get:

C6H12 + O2 = 6 CO2 + 6 H2O

Now all that's left is to balance the oxygens

We see how there is 18 oxygens on the right side of the equation which means there must be 18 on the left side.

Because we have oxygen gas we divide 18 by 2 which means there are 9 O2's on the left side

Therefore, the balanced equation is C6H12 + 9O2 = 6 CO2 + 6 H2O

Answer:

fluorine

Explanation:

Answer:

The solution turns purple because ammonia is a base.

The solution turned red.

Ammonia gas is neutral, but ammonia solution ( ammonium hydroxide ) is a base.

Adding vinegar to ammonia suppresses its dissociation hence decrease in hydroxyl ion concentration.

If more ammonia is added to the solution, the pink color re-appears.

Answer:

There are essentially three methods used to produce ethanol:

Manufacture from ethene using steam (the "synthetic" route)

Production from sugars and starches by fermentation, using yeasts.

Production from biomass waste, using bacteria.

Please give brainlist if this helped

Answer: A catalyst is a substance that speeds up the rate of a chemical reaction without being used up and remains chemically unchanged itself .

Explanation: For a reaction to take place the particles must collide with enough energy for bonds to break and reaction to occur .

BUT when a catalyst is present the reactants are able to react in a way that requires less energy ,leading to more successful collision so the reaction speeds up without the chemical composition of the catalyst being affected

NOTE: the catalyst must be chosen to suit the particular reaction

HOPE THIS HELPS IF YOU NEED MORE EXAMPLES FEEL FREE TO COMMENT IN THE COMMENT SECTION

Answer:

400 cm³ of ammonia, NH₃.

Explanation:

The balanced equation for the reaction is given below:

N₂ + 3H₂ —> 2NH₃

From the balanced equation above,

3 cm³ of H₂ reacted to produce 2 cm³ of NH₃.

Finally, we shall determine the maximum volume of ammonia, NH₃ produced from the reaction. This can be obtained as illustrated below:

From the balanced equation above,

3 cm³ of H₂ reacted to produce 2 cm³ of NH₃.

Therefore, 600 cm³ of H₂ will react to produce = (600 × 2)/3 = 400 cm³ of NH₃.

Thus, 400 cm³ of ammonia, NH₃ were obtained from the reaction.

Answer:

the oxidation number of those elements is 2 because some of them are molecules

Answer:

net ionic equation

[tex]\boxed{ SO_4{}^{2-} {}_{(aq.)} + Ba^{2+} {}_{(aq.)} \rightarrow BaSO_4 {}_{(s)}} [/tex]

Answer:

hope this helps.answer is in the picture