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Which layer of the atmosphere reflects radio waves back to Earth?
A. Mesosphere
B. Stratosphere
C. Thermosphere
D. Troposphere

Answers

Answer 1

Answer:

Thermosphere

Explanation:

More specifically the ionosphere, since the ionosphere is the lower part of the thermosphere.

Hope this helps!


Related Questions

Need asap thank you

Answers

Answer:

c.boron-11

Explanation:

The atomic mass of boron is 10.81 u.

And 10.81 u is a lot closer to 11u than it is to 10u, so there must be more of boron-11.

To convince you fully, we can also do a simple calculation to find the exact proportion of boron-11 using the following formula:

(10u)(x)+(11u)(1−x)100%=10.81u

Where u is the unit for atomic mass and x is the proportion of boron-10 out of the total boron abundance which is 100%.

Solving for x we get:

11u−ux=10.81u

0.19u=ux

x=0.19

1−x=0.81

And thus the abundance of boron-11 is roughly 81%.

Covalent compounds are generally not very hard. Justify the statement.

Answers

Covalent compounds are generally not very hard because they are formed by two or more nonmetallic atoms.

COVALENT COMPOUNDS:

Covalent compounds are compounds whose constituent elements are joined together by covalent bonds.

Covalent bonding occurs when two or more nonmetallic atoms of an element share valence electrons. This means that covalent compounds will not be physically hard since they constitute non-metals.

Examples of covalent compounds are:

H2 - hydrogenH2O - waterHCl - hydrogen chlorideCH4 - methane

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You have 15 grams of of MgSO4, how
many moles of MgSO4 do you have?
A 0.125 Moles of MgSO4
B 0.75 Moles of MgSO4
C 7.5 Moles of MgSO4
D 15.88 Moles of MgSO4

Answers

Answer:

C 7.5 Moles of MgSO4

Explanation:

2.
The highest part of the wave is called the ____________.
Group of answer choices

A. best

B. crest

C. top

D. trough

Answers

Answer:

B. crest

Explanation:

The highest part of a wavelength is called the crest, meanwhile, the lowest part is the trough.

Answer:

b

Explanation:

it's highest because it have the most higher wave

Answer choices are A. Constant speed
B. Stopped
C.Moving sideways
D.Accelerating

Answers

B.stopped
Bahahahhaahhahhahah


[tex]{ \red {\sf{Define \: Transportational}}}[/tex]
2+x=19
Find x ​

Answers

Answer:

Easy!!

2+17=19

#hope that helps

Answer:

To find the answer you may

2+17=19

Explanation:

so that is the answer I'm sorry,to not give all the solutions

A 4.190 g sample of an oxide of chromium contains 2.179g of chromium, what is its empirical formula?

a. CrO2
b. Cr2O
c. CrO3
d. Cr2O3

Answers

I'm not sure but I think it is C. CrO3

4) If an object is traveling at a speed of 400 m/s, how long (in hours) will it take to reach 950.5 km?

A) 3.96 x 10-2

B) 1.43 x 105

C) 6.34

D) 39.6

E) 7.01 x 10-6

Answers

Answer:

Answer: 0.66 hours

Explanation:

[tex]{ \rm{time = \frac{distance}{speed} }} \\ \\ { \rm{time = \frac{(950.5 \times 1000) \: m}{400 \: m {s}^{ - 1} } }} \\ \\ { \rm{time = {2376.25 \: s}}}[/tex]

• Remember 1 second accounts for 1/3600 hours

[tex]{ \rm{time = \frac{2376.25}{3600} }} \\ \\ { \rm{time = 0.66 \: hours}}[/tex]

The time taken by object  traveling at a speed of 400 m/s to reach 950.5 km distance is 0.66 hr or 39.6 min.

What is average velocity ?

Average velocity is given by the total distance covered by the object in total given time. SI unit of velocity is m/s.

Here in this question it is given that the object is travelling with speed v of 400 m/s and it is to find the time t to reach 950.5 km distance d.

it is known that 1 km = 1000 m

that is 950.5 km = 950500 m

Now, using the relation of speed-distance to find time t to reach 950.5 km distance :

[tex]\begin{aligned}v&=\frac{d}{t}\\t&=\frac{d}{v}\\&=\frac{950500}{400}\\&=2376.25 \text{ s}\end{aligned}[/tex]

Now converting 2376.25 sec into hrs by dividing it by 3600 we get :

2376.25/3600 = 0.66 hr or 39.6 min.

Therefore, the time taken by object to reach 950.5 km distance is 0.66 hr or 39.6 min.

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WHICH ONE?????????????????? Brainlest

Answers

Answer:

I believe it would be C, The number of atoms in the reactants is equal to the number of atoms composing the products

Explanation:

hope this helps! :D

have a miraculous day!! <3

Answer:

The number of atoms in the reactants is equal to the number of atoms composing the products

true or false a change in state of matter would be considered a physical change​

Answers

Answer:

true

Explanation:

Because the changes in state of matter would be considered

What is the theoretical amount of sodium citrate (Na3C6H5O7) produced if you react 85.0g of citric acid (H3C6H5O7) in excess amount sodium hydroxide? If you actually produced 97.3 g of sodium citrate what is the percent yield?

Answers

Answer:

i did not find the amswer sorry

Calculate the mass percentage of each element in aluminum oxide.

Answers

Answer:

So, Percentage Composition of Aluminium = 2778×100%=34.62% (approx.) Percentage Composition of Oxygen = 3×1678×100%=61.54% (approx.)

The temperature went from 25 to 90 degrees Celsius. What is the CHANGE in temperature?

Answers

Answer:

+65 degress ?

Explanation:

I feel like there is more to this question

what is the mass in g of 7.009 x 10^21 molecules of Pl3?

Answers

I have completed the problem

pa help thank yoeee <3333 ​

Answers

Answer:

1.c

2.c

3.a

4.b

5.a

i think that's the answer

what is the molecular geometry of AsCl3?

Answers

what is the molecular geometry of AsCl3?
Answer: The arsenic atom is surrounded by 4 regions of electron density, which means that its has a steric number equal to 4. According to VSEPR Theory, the molecular geometry will be trigonal pyramidal, AX3E1.

Picture:

Molecules' general shape, as well as bond lengths, bond angles, torsional angles, and any other geometrical factors that affect each atom's position, are revealed by their molecular geometry. The molecular geometry of AsCl₃ is trigonal pyramidal.

Molecule geometry is the study of the three-dimensional configuration of the atoms that make up a molecule. Because the shared pairs of electrons remain localized in a specific location between the nuclei of the involved atoms, covalent molecules have directed bonds.

The arsenic atom is surrounded by 4 regions of electron density which means that it has a steric number equal to 4. According to VSPER Theory, the molecular geometry will be trigonal pyramidal, AX₃E₁.

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Write the symbol for every chemical element that has atomic number greater than 3 and atomic mass less than 15.4 u.

Answers

Answer:

N, B, Be, C

Explanation:

N (Nitrogen) has 14.0067 B (Boron) has 10.81 Be (Beryllium) has 9 and C (Carbon) has 12

The symbols for every chemical element that has atomic number greater than 3 and atomic mass less than 15.4 u are C, N, O, F, and Ne.

To find elements with atomic number greater than 3 and atomic mass less than 15.4 u, we'll consider the periodic table. Elements with atomic numbers 4 (Be) and higher meet the atomic number criterion. For the atomic mass, we'll look at elements with atomic masses below 15.4 u.

The chemical elements that fulfill both criteria are: Carbon (C) with atomic number 6 and atomic mass 12.01 u, Nitrogen (N) with atomic number 7 and atomic mass 14.01 u, Oxygen (O) with atomic number 8 and atomic mass 16.00 u, Fluorine (F) with atomic number 9 and atomic mass 18.99 u, and Neon (Ne) with atomic number 10 and atomic mass 20.18 u.

These elements meet the conditions of having atomic number greater than 3 and atomic mass less than 15.4 u. Therefore, the symbols for these elements are C, N, O, F, and Ne.

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1.
Light is a(n) _______wave.

Group of answer choices


A. longitudinal


B. large


C. ocean


D. transverse

Answers

Answer: D. transverse

Explanation:

Light is a transverse wave, while sound is a longitudinal wave.

What is the role of starch in the titration reaction?

Answers

Answer:

Starch reacts with Iodine in the presence of Iodide ion to form an intensely colored blue complex, which is visible at very low concentrations of Iodine, making it a very good indicator in both direct and indirect lodometric titrations.

Explanation:

hope this helps

What volume of 0.826 MKOH solution do you need to make 3.74 L of a solution with a pH of 12.500?

Answers

Given that –

pH = 12.5

We know that –

pH + pOH = 14

Then –

[tex]\qquad[/tex][tex]\bf\longrightarrow pOH = 14 -12.5 [/tex]

[tex]\qquad[/tex][tex]\sf \longrightarrow pOH = 1.5[/tex]

[tex]\qquad[/tex][tex]\sf \longrightarrow [OH^- ] = 10^{-1.5 }[/tex]

[tex]\qquad[/tex][tex]\bf \longrightarrow [OH^-] = 3.16 × 10^{-2}[/tex]

Now the number of moles of KOH need to ensure that concentration of Hydroxide anions is equal to –

[tex]\qquad[/tex][tex]\bf \longrightarrow 3.74\: L \times \dfrac{3.16× 10^{-2}}{1 \: L }[/tex]

[tex]\qquad[/tex][tex]\bf \longrightarrow 1. 18 × 10^{-1 }M [/tex]

Volume of the solution contains the need number of moles of Hydroxide anions –

[tex]\qquad[/tex][tex]\sf \longrightarrow \dfrac{ 1.18×10^{-1} \: moles \: OH^-}{0.826 \: moles \: OH^-}[/tex]

[tex]\qquad[/tex][tex]\sf \longrightarrow 0.143 L [/tex]

[tex]\qquad[/tex][tex]\sf \longrightarrow 0.143 \times 1000[/tex]

[tex]\qquad[/tex][tex]\pink{\bf\longrightarrow 143 mL }[/tex]

______________________________________

1. Here is a chemical equation: C2H2 + O2 → CO2 + H2O
• A Balance this chemical equation.
• B State what type of chemical reaction this is.
• C What will happen during this reaction besides just CO2 and H2O being released.
• D Discuss how your balanced chemical equation agrees with the law of conservation of mass.

2. Balance each of the reactions listed below. What type of reactions are they? Single-displacement, double-displacement, synthesis, decomposition, or combustion reaction.
• A Na + Cl2 → NaCl
• B Fe + O2 → FeO

Answers

Answer:

1)  a) 2 C2H2 +  3O2 -->  2CO2 +  2H2O

b) Combustion Reaction

c) Bonds will be broken on the reactant side which will require energy.

d) It agrees with the law of conservation of mass because there are the same amount of molecules of each element on both sides of the equation, meaning mass was not created nor destroyed.

2) a) 2Na + Cl2 --> 2NaCl

        Synthesis

   b) 2Fe + O2 --> 2FeO

        Synthesis

Hope this helps!

Explanation:

To calculate the atoms of an element in a given molecule, we need to multiply stoichiometry by the number that is written on the foot of that element. Therefore, the balanced equation is

2 C[tex]_2[/tex]H[tex]_2[/tex]+  3O[tex]_2[/tex] [tex]\rightarrow[/tex] 2CO[tex]_2[/tex]+  2H[tex]_2[/tex]O

What is Balanced equation?

Balanced equation is the one in which the total number of atoms of a species on reactant side is equal to the total number of atoms on product side. The mass of the overall reaction should be conserved. There are so many types of chemical reaction reaction like combination reaction, displacement reaction.

a) 2 C[tex]_2[/tex]H[tex]_2[/tex]+  3O[tex]_2[/tex] [tex]\rightarrow[/tex] 2CO[tex]_2[/tex]+  2H[tex]_2[/tex]O is the balanced equation

b)Reaction is a Combustion Reaction

c) energy is required for the breaking of bond.

d) It agrees with the law of conservation of mass as the number  of atoms of each element on reactant and product side is same.

Therefore, the balanced equation is

2 C[tex]_2[/tex]H[tex]_2[/tex]+  3O[tex]_2[/tex] [tex]\rightarrow[/tex] 2CO[tex]_2[/tex]+  2H[tex]_2[/tex]O

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Select True or False: Consider the reaction N2(g) 3H2(g) 2NH3(g). The production of ammonia is an exothermic reaction. When heat is added to the equilibrium system it will shift to increase the amount of ammonia produced.

Answers

Answer:

False

Explanation:

As I like to think of it, equilibrium will shift either 'forwards' (to increase products) or 'backwards' (to increase reactants) to oppose any change in system;

If heat is added, the equilibrium will shift in the direction that reduces heat within the system;

In other words, it will shift in favour of the endothermic reaction, i.e. the reaction where heat is gained by the molecules/atoms and therefore taken out from the system;

If the 'forwards' reaction, producing NH₃, is exothermic (i.e. energy is released in the reaction), then the 'backwards' reaction is endothermic;

So the equilibrium will shift in this direction, which is the reaction of 2 NH₃ molecules producing N₂ and 3 H₂

What kind of intermolecular forces act between two chloramine (NH2CI) molecules?

Answers

Explanation:

brain and heart froce acts between two chloramine

Answer:

Dispersion, Hydrogen-bonding, and Dipole forces act between two chloramine (NH2CI) molecules.

Explanation:

Dispersion is exerted between all molecules. Chloramine is polar, therefore dipole forces are present. The molecular geometry of chloramine (NH2Cl) is a trigonal pyramidal, therefore hydrogen-bonding forces are present.

Which population will increase?

Answers

Answer:    World 5,306,425,000 6,895,889,000 7,503,828,180

1 China 1,139,060,000 1,341,335,000 1,384,688,986

2 India 873,785,000 1,224,614,000 1,296,834,042

3 United States 253,339,000 310,384,000 329,256,465

Explanation:

A block has 73 kg is being pushed and accelerated at rate of 10 m/s. what force is being applied to the block?



730 N



7.3 N



7300 N



730 Kg

Answers

Answer:

730 N

Explanation:

force =mass ×acceleration

force= 73kg×10m/s

F=730N

I’m not sure if it’s the square on the right or left. Please help

Answers

Answer:OK im not 100% sure but it should be the right one

Explanation:

It should DEFINITELY be the square on the right.

Most rain falls _____________________.
on land


in freshwater lakes, rivers, and streams


on the oceans


on the polar ice caps

Answers

Answer:

I think it is a)in freshwater lakes,rivers,and stream

Answer:

a) in freshwater lakes, rivers, and streams

#keep learning :)

2). How are simple carbohydrates, like glucose, used to build starches?​

Answers

Carbohydrates which include sugars and starches are the primary energy sources produced in plants and used by heterotrophic organisms.

Carbohydrates are composed of a basic chemical formula that typically contains a ratio of one Carbon atom for every two Hydrogen atoms and one Oxygen atom C1H2O1. Basically one carbon atom for every one water molecule Carbon + Water = Carbohydrate.

Monosaccharides or Single Carbon Chain Sugars include Glucose C6H12O6

Disaccharides or Double Carbon Chain Sugars include Sucrose C12H22O11

Combining monosaccharides and disaccharides create Polysaccharides which are complex sugars called starches.

A block has 73 kg is being pushed and accelerated at rate of 10 m/s. what force is being applied to the block?

A-730 N
B-7.3 N
C-7300 N
D-730 Kg

Answers

Answer:

730 N

Explanation:

force =mass×acceleration

force= 73kg × 10 m/s

f=730N

How many grams of NaOH is needed to neutralize 90 mL of 1.5 N HCl?

Answers

mol = conc × v

= 1.5 × 0.09

= 0.135 moles of HCl

HCl + NaOH > NaCl + H2O

1 mole HCl = 1 mole NaOH

0.135 mol HCl = x

x = 0.135 mol NaOH

mass = mol × molar mass

= 0.135 × 40

= 5.4 g

NaOH = 23 + 16 + 1 = 40 g/mol

I'm not a 100% sure if it's correct

Other Questions
The table below shows the deposits (+) and withdrawals ( - ) each week for a newly opened bank account with a starting balance of $100.DEPOSITS ANDWITHDRAWALSWeek 1+120Week 2 -100Week 3 +50Week 4 PWeek 5 +200Week 6 -100Week 7 -25Week 8 +50Part A: What is the value of p if the account shows a zero balance after 4 weeks? I need help on this 1 problem on math please Help me!!!!!!!!!!!!!!!!!!!!!!! A reading researcher does what A bakery made 24 cherry pies, using 114 cherries for each pie. They threw away 35 cherries that were bad. If they used all the cherries they had, how many cherries did they start off with? Conjugate each verb in parentheses into the imperfect tense (2 points each).Cuando mis padres 1. ______________ (ser) nios, ellos 2. ______________ (jugar) con muecas y bloques y 3. ______________ (leer) muchos libros. Mi mam 4. ____________ (bailar) mucho y mi pap 5. ____________ (ir) al patio de recreo porque 6. ____________ (gustar) jugar con sus amigas all. Answer the following questions. Make sure to show all your work.1. In each case below, show if the point given is a solution to the system ofequations.a.)Point (-0.8,-0.6)Equation 1 - y = 2x + 1Equation 2 - y = -3x - 3b.)Equation 1 - x + y = 3Equation 2 - y + 2 / 2 = xPOINT - (1/3, 2)PLZ HELP ME 1. Edna bought an RTW dress for Php575.00 at 20% discount. What wasthe original price? let f(x)=x-3 and g(x)= 3x^2. perform the function operation and then find the domain of the result. (f-g)(x) I need help with this Most rain falls _____________________.on landin freshwater lakes, rivers, and streamson the oceanson the polar ice caps what did the first modern vending machine dispense? -Drag the steps for drawing a graph of the function f(x) = 2(x+4)2 - 3 toarrange them in the correct order. It might help you to draw the graph asyou arrange the steps.Plot the vertex (-4,-3).Draw the axis of symmetry x=-4.Reflect the points over the axis of symmetry and plot (-5, -1), (-6,5), and (-7,15).Apply the 2x? pattern, from the vertex go right 1 up 2 and plot (-3,-1).Apply the 2x pattern again, from the vertex go right 2 up 8 and plot (-2,5).Apply the 2x pattern a 3rd time, from the vertex go right 3 up 18 and plot (-1,15)Draw a U shaped parabola 1. How did the British generals first plan to break the Patriot siege of Boston? A. The British wanted to fortify the high ground around Boston B. The British determined the best plan of attack was to stage a direct assault on the Patriots C. The British staged a complicated series of military maneuvers to confuse the Patriots D. The British planned to bombard the Charlestown Peninsula from the sea What is needed to get accurate measurement of distance/length? Explain Which statement best explains the environmental drawback of using geothermal energy over energy generated by fossil fuels? More cost-effective over time Less pollution than fossil fuel plants More energy plant locations available Changes to regional landscapes The ideas of various Enlightenment thinkers contributed to the creation of the Bill of Rights byA showing there was a need for a powerful chief executiveB providing the nation with a national court systemdemonstrating a need to protect the rights of individualsD encouraging economic development by the national government PLEASE HELP ASAP OF YOU DO FOD BLESS YOU BECAUSE IT WILL RAISE MY GRADE Qu es una restriccin FACTIBLE?El tema es sobre Programacin Lineal.Por favor no se roben los puntos, necesito una respuesta.NO WIKIPEDIA. Write any two uses of ruler in word program