Among electromagnetic waves, UV rays are most dangerous because exposure to these radiation cause serious problems in living organism. The energy of wave is 2.08×10⁻¹⁵J.
What is electromagnetic wave?
Electromagnetic wave is a wave which contain two component one is electric component and other is magnetic component. The electric and magnetic component are perpendicular to each other. There are so many wave that comes under electromagnetic wave like infrared wave , radio wave .There is a relation between energy of wave. frequency of wave
Mathematically,
E=hv
where,
E = energy of electromagnetic wave
h is planks constant having value 6.67×10⁻³⁴js
v= frequency of wave
substituting the given values
E= 6.67×10⁻³⁴js×3.12 x 10¹⁸ s⁻¹
E= 2.08×10⁻¹⁵J
Therefore the energy of wave is 2.08×10⁻¹⁵J.
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The atomic radius of magnesium is 150 pm. The atomic radius of strontium is 200 pm. What is the atomic radius of calcium
Answer:
The atomic radius of calcium is approximately 175
Explanation:
Given that the atomic radius of magnesium = 150 pm
The atomic radius of strontium = 200 pm
Therefore, given that calcium comes in between magnesium and strontium in group 2 of the periodic table, the atomic radius should be half way between the length of the atomic radius of magnesium and strontium, given that the atomic radius is not a fixed quantity
Therefore;
The atomic radius of calcium is approximately given as follows;
The approximate atomic radius (200 + 150)/2 = 175 pm.
What is the total number of carbon atoms in 10C4H10?
Answer:
40 C atoms
Explanation:
Step 1: Write organic compound
10C₄H₁₀
We see here that in 1 mol of C₄H₁₀, we would have 4 atoms of C.
We are given that we have 10 moles of C₄H₁₀.
Therefore, we have 4 · 10 = 40 atoms C
What would happen if the amount of freshwater entering mono
lake increased?
Answer:
The salinity would decrease, which can lead to a huge change in the ecosystem. The brine shrimp and flies may for off, because there isn't enough salt for them. This would cause the bird population to decrease, because they wouldn't have the shrimp and flies as a food source.
Which of the following is NOT a homogeneous mixture? *
koolaid
soda
tea
water
Answer:
water
Explanation:
Because it does not have more than one component.
The Moon’s appearance changes during its ________ around Earth. These changes are called ____________________.
Fill in the blank
Get brainiest for correct
Answer:
The Moon’s appearance changes during its orbit around Earth. These changes are called phases.
Explanation:
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Which word best replaces reach without changing the meaning of the sentence?
I can't help you because your request is beyond the reach of my department.
guidelines
purview
discretion
outreach
Purview is the word that best replaces reach without changing the meaning of the sentence. Therefore, the correct option is option B.
What is statement?A sentence is indeed a collection of words used to express a thought. A sentence always begins with such a capital letter then concludes with a period, punctuation mark, and exclamation point. Ideal sentence construction has a verb and a subject. Declarative sentences make a declaration, express an opinion, or make an emotion known.
Declarative sentences have a period at the end. Questions are asked in sentences known as interrogatives. These phrases are followed by a question mark. This kind of phrase is used to give instructions or make a request. There is typically a period at the end, but occasionally there is also an exclamation point. Univocal means having only one possible meaning. Purview is the word that best replaces reach without changing the meaning of the sentence.
Therefore, the correct option is option B.
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the pH scale describes the negative log of the percent _____
ion in a solution
Answer:
The pH of a solution is the negative logarithm of the hydrogen-ion concentration. The pH of pure water or any neutral solution is thus 7.00.
Explanation:
Answer:
hydrogen concentration
Explanation:
largest atomic radius in period 4 row
Answer:
hi
Explanation:
Thus, helium is the smallest element, and francium is the largest.
Write the electron configuration for element 53. Use the noble gas notation.
Answer:
2,8,8,8,8,8,8,3
Explanation:
Electron Configuration is the distribution of electrons of an atom or molecule in atomic or molecular orbitals.
What is the most likely reason that nonmetals are electrical insulators?
Since valence shells are mostly empty in nonmetal atoms, the atoms attract and hold any electrons they can in order to fill their valence shells.
Since valence shells in nonmetal atoms are almost full, the atoms attract electrons and hold them tightly to fill their valence shells.
Since all nonmetals have valence shells that are full, they hold electrons tightly to avoid changing.
Since all nonmetals have valence shells that are completely empty, they do not attract or release any electrons.
Answer:
Since valence shells are mostly empty in nonmetal atoms, the atoms attract and hold any electrons they can in order to fill their valence shells.
Answer:
a
Explanation:
wich organelle is found in photosynthesis organisims and caprures energy from the sun
Plastid is the organelle that can the substance. chlorophyll that performs photosynthesis
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Travis is warming up before basketball practice. Which of these activities would provide the best dynamic stretch to prepare him for sprinting?
Forward bends
Arm rotations
Neck extensions
Leg swings
Answer:
Leg swings sounds good but not to sure
Explanation:
I mean in order to play basketball gotta warm up your legs
Answer: Leg swings
Explanation: Leg swings would be best for preparing to sprint because you will have to move you legs very quickly, and leg swings would be a good warm up without tiring yourself out.
I have learned that the law of acceleration can be applied in the
following situations
1.
2.
3.
helpppp poooooo
Answer:
See explanation below
Explanation:
Let's recall what's the law of acceleration.
First of all, the acceleration is a vector that has the change of velocity in function of the time.
Now, the law of acceleration is related to Newton's Second law which states that an object will move only if there are forces around it. In other words, the following expression:
F = m . a
Now, in this case, we know that the acceleration of an object is affected by a force always. So, if an object stand still, it will not move unless you push it or pull it to move, and the acceleration will speed up or down depending of the force it was exerted.
According to this, the law of acceleration can be applied here:
1. A bike going down a hill. Of course, because, let's suppose you let a bike alone go down on a hill, you will see that the speed of the bike will be faster as time goes by. This is because the force acting here is the weight of the bike and gravity.
2. Dropping a ball from a building. In this case, you drop a ball from a high floor on a building, it will happen the same thing as the bike. It will go faster because of gravity.
3. Putting the break on a car. Now in this case it's easy because you only need to know that when you put the brakes, the speed of the car will go down, but also the acceleration. So there's no need of a further explanation of this.
Hope this helps
What element is represented by this configuration: [Ar]452*
Be
Mg
Ca
Na
Answer:
its sulfur
Explanation:
that's what Google says
A proton is a subatomic particle carrying a charge equal to but opposite that of an electron
true
false
Answer:
True
Explanation:
A proton has a charge of +1, while an electron has a charge of -1. This is why a neutral atom has the same number of protons as electrons.
Neutrons have no charge, hence their name neutron which is similar to neutral.
lol pls help... i need examples of covalent bond, ionic bond, and metallic bonds using real life objects.
Answer:
cavalent bond =diamond, carbon, silica, hydrogen gas, water, nitrogen gas
ionic= i don't know
metallic bonds= Silver, gold, nickel, copper, ironl, cobalt, calcium and magnesium, gold, barium, platinum, chromium,
Explanation:
not all are objects so pick the ones that are.
Which of these is a chemical property of aluminium
Answer:
Option 1
Explanation:
Density of 2.70 g/cm^-3
Answer:
Explanation:
For it’s actually ( Aluminium is highly reactive )
kinetic energy is energy that an object possesses because of its
Kinetic energy is the energy possessed by an object due to its motion. If an object is moving, then it has kinetic energy. If an object has kinetic energy, then it is moving. Many students confuse kinetic energy with potential energy.
How many grams of Sodium will have the same number of atoms as 6 grams of Magnesium?
Atomic mass of Sodium is 23 u and atomic mass of Magnesium is 24 u.
Answer:
92gm
Explanation:
Atomic mass of Mg=24g=1 mole of Mg
∴ 24g =1 mole of Mg contain 6.022×10^23 atom
∴ 6gm contains 246.022×1023×6
=4×6.022×10^23 atoms
Now according to question, there are 6.022×1023 atoms of Na
23gm of Na contains 6.022×10^23 atoms
∴6.022×4×10^23 atoms of Na weighs 23×6.022×10^23×4/6.022×10^23⇒92gm
What is the role of the ozone?
A. It protects earth's surface from dangerous radiation.
b. It reflects the sun's energy.
c. It is the source of rain clouds.
D. It retains heat energy given up by water.
Answer:
It protects the earth surface from dangerous radiation
The compound acetaldehyde most likely contains the functional group shown below:
-C-
downwards equal sign
O
true or false.
True
Further explanationAldehydes are alkane-derived compounds containing the functional group (-CO-) located at the end of the parent carbon chain
The general structure is R-CHO with the molecular formula CnH2nO
Naming is generally the same as the alkane by replacing the suffix with -al
Acetaldehyde(ethanal) is an aldehyde which has 2 C atoms with formula
[tex]\boxed{\bold{C_2H_4O}}[/tex]
The bond between the C atom and the O atom is a double bond
So the C atom has a single bond with H and alkyl and double bonds with O
R - C - H
||
O
A student has a rectangular block. It is 2 cm wide. 3 cm tall and 25cm long. It has a mass of 600 g. First, calculate the volume of the block:
Answer:
The area of the block is 150 cm
Explanation:
describe a procedure to remove the water from the mixture that passes through the filter and collects in the beaker.
Answer:
The procedure is Filtration
Explanation:
Filtration is a process that is use to separate insoluble solid from liquid for example Salt and water.
This process uses filter paper which is placed inside a funnel and then placed inside a beaker.
The mixture of sand and water is poured into the the filter paper and water then drains out down to the funnel and the beaker.
The solid part remain at the filter paper and it is called the residue and the water is the filtrate.
an object has a mass of 57.6g . find the object's density, given that's it's volume is 40.25cm^3
Answer:
The answer is 1.43 g/mLExplanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\[/tex]
From the question
mass = 57.6 g
volume = 40.25 cm³
We have
[tex]density = \frac{57.6}{40.25} \\ = 1.431055900...[/tex]
We have the final answer as
1.43 g/mLHope this helps you
How does water move from the hydrosphere to the atmosphere?
O A. Precipitation
B. Percolation
O C. Evaporation
D. Condensation
A(n) ______________ is an organism that lives on another organism and causes harm to that organism
Answer: The answer is Parasite ma dude
Explanation:
In evolutionary ecology, parasitism is a symbiotic relationship between species, where one organism, the parasite, lives on or in another organism, the host, causing it some harm, and is adapted structurally to this way of life.
Hopes this helps
Answer:
The answer of tis fill inthe blanks is tape worm because they suck the blood of their host its other example are liver fluje
Find the force of the mass is 6kg and the acceleration is 12 m/s/s
Answer:
72N
12m/s
Explanation:
f=ma
=6×12
=72N
a=f÷m
=72÷6
=12m/s
what is the role of the sun in forming convection currents in earths water and air?use scientific reasoning to construct your answer.
Answer:
The heating of the Earth's surface and atmosphere by the sun drives convection within the atmosphere and ocean. This convection produces winds and ocean currents. The greater the pressure differences between a low-pressure area and a high-pressure area, the stronger the winds. I hope this helps
The sun heats the air near the equator of the earth, it becomes less dense and rises upward. As warm air rises, it cools and gets less dense than the air around it.
What is convection?Convection can be d defined as the transfer of heat from one place to another due to the movement of heat or fluid. Convective heat transfer involves the processes of conduction as well as advection.
Gases and liquids can not be good conductors of heat under normal conditions, but they can easily transfer heat.
Convection occurs through diffusion or advection but does not take place in solids, as there is no movement of its constituent particles happens. The diffusion of heat in solids is known as thermal conduction.
The heat transfer that occurs between a surface and a liquid that is in contact with the surface is convection heat transfer.
The Sun provides the energy for the convection in the ocean and produces ocean currents. There are two kinds of ocean currents: one is surface currents and the other deep currents.
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Convert each of the following lengths to the units requested.
a. 17.3 m to centimeters
b. 2.56 m to kilometers
567 dm to meters
5.13 m to millimeters
Answer:
1730 cm
0.00256 km
5130 mm
Define physical change
Answer to Question.
A physical change is a change to the physical—as opposed to chemical—properties of a substance. They are usually reversible. The physical properties of a substance include such characteristics as shape (volume and size), color, texture, flexibility, density, and mass.