Answer:
Cell phones use radio waves to communicate with cell towers, and these waves have wavelengths of approximately 10-1000 m, which are much too large to be ionizing. WiFi actually operates at quite precise frequencies, either 2.4 GHz or 5 GHz, which correspond to wavelengths of either 12 cm or 6 cm.
Explanation:
When the mobile phone is turned on, it emits radio waves that consist of radio frequency (RF) energy—a form of electromagnetic radiation moving at the speed of light. It works by transmitting radio wave signals to (and receiving these from) nearby base stations.
♦ O people, evidence has come to you from your Lord, and we have sent down to you a clear light ﴾[An-Nisa: 174].
Answer:
Qura'an is what makes my day, I read it every morning and it makes me relaxed. I love reading the Qura'an. Do dua for me because I hope I am gonna memorize it after I finish reading it with tajweed.
Explanation:
Answer:
:)
Explanation:
Quran is something that makes you feel relax.
Can someone please help me answer these 2 questions
Answer:
Days of the week are arranged in rows from left to right
Mondays in a Month are arranged in columns from top to bottom
Explanation:
What does it mean if an element has no subscript in a chemical formula?
A. There are an uncertain number of atoms of that element in the
molecule.
B. The number of atoms of that element in the molecule can vary.
C. There is one atom of that element in the molecule.
D. There are no atoms of that element in the molecule.
there is one atom of that element in the molecule
what is a solution of zinc and copper?? PLS HELP
five letter word
C3H8 + 502 -->3 CO2 + 4H20 In the equation, what is the mole ratio of reactants?
One light beam has wavelength, and frequency, fl. Another light beam has wavelength, in, and frequency, f2. Write a proportion that shows how the ratio of the wavelengths of these two light beams is related to the ratio Of their frequencies.
The question is missing. Here is the complete question.
One light beam has wavelength, [tex]\lambda_{1}[/tex], and frequency, f₁. Another light beam has wavelength, [tex]\lambda_{2}[/tex], and frequency, f₂. Write a proportion that shows how the ratio of the wavelengths of these two light beams is related to the ratio of the frequencies.
Answer: [tex]\frac{f_{1}}{f_{2}} =\frac{\lambda_{2}}{\lambda_{1}}[/tex]
Explanation: In vacuum, eletromagnetic waves travels at a constant speed called "speed of light", whose symbol is [c] and magnitude is 3x10⁸m/s.
Speed of light, frequency and wavelength are related by the formula:
[tex]c=\lambda.f[/tex]
So, if one light beam has wavelength and frequency, [tex]\lambda_{1}[/tex] and f₁, respectively, the second beam has wavelength [tex]\lambda_{2}[/tex] and frequency f₂ and both travel at speed of light:
[tex]\lambda_{1}f_{1}=\lambda_{2}f_{2}[/tex]
[tex]\frac{f_{1}}{f_{2}}=\frac{\lambda_{2}}{\lambda_{1}}[/tex]
Then, the ratio that shows the relation between frequencies and wavelengths of these light beams is [tex]\frac{f_{1}}{f_{2}}=\frac{\lambda_{2}}{\lambda_{1}}[/tex]
Which of the elements below has the largest electronegativity? Na, Mg, S, P?
HURRY!!!
Answer:
Electronegativities generally decrease from top to bottom within a group due to the larger atomic size.
Of the main group elements, fluorine has the highest electronegativity (EN= 4.0) and cesium the lowest (EN=0.79).
Explanation:
Sulfur has the largest electronegative element. Therefore, option C is correct.
What is electronegativity?Electronegativity is a measure of an atom's ability to attract electrons toward itself in a covalent bond, and it generally increases as you move across a period from left to right in the periodic table.
The type of bond that exists between atoms will depend on the electronegativity of the system.
Out of the given elements, S (sulfur) has the largest electronegativity. Sulfur has an electronegativity value of 2.58 on the Pauling scale, while Na (sodium) has an electronegativity value of 0.93, Mg (magnesium) has an electronegativity value of 1.31, and P (phosphorus) has an electronegativity value of 2.19. Therefore, option C is correct.
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Why is aluminium used to make outer covering of aeroplane?
Aluminium alloys are used because they are light, relatively strong and inexpensive. Aluminum on its own is very soft and weak. However add about .24% copper and it becomes heat treatable and the 2024 alloy also age hardens. This works well for the skin of the aircraft. Rivets made from the 2117 alloy (.17% copper) work harden. This means they become hard as they are installed, resulting in a strong, durable structure. However aluminum alloys do have their limitations, and repeated cabin pressurization cycles can result in fatigue and cracking. These are normally found and repaired during the various aircraft letter checks.
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Which temperature represents the highest average kinetic energy of the particles in a sample of matter?
Answer:
41 Which temperature represents the highest average kinetic energy of the particles in a sample of matter? (1) 298 K (3) 27°C (2) 267 K (4) 12°C
Explanation:
highest average kinetic energy highest temperature
Answer:
the answer is 27
Explanation:
The piece of metal is magnetic
Answer:
Explanation:
Magnetic materials are always made of metal, but not all metals are magnetic. Iron is magnetic, so any metal with iron in it will be attracted to a magnet. Steel contains iron, so a steel paperclip will be attracted to a magnet too. Most other metals, for example aluminium, copper and gold, are NOT magnetic.
Identify the phase change described by the following equations.
a. C18H38(s) → C18H38(l) _______________________
b. CO2(g) → CO2(s) _______________________
c. NH3(l) → NH3(g) _______________________
Answer:
it is b
Explanation:
Becuase CO2(g) is the right answer bc i said so ok if u think im wrong ask your mom of if u say im dum im not im a teacher ok bye
Which statement is true about covalent AND ionic bonds?
1. Covalent bonds share their valence electrons, while ionic bonds transfer electrons between atoms
2. Covalent transfer electrons between atoms while ionic bonds shares electrons
3. Both covalent and ionic bonds form new compounds by sharing electrons between atoms
4. Both covalent and ionic bonds form new compounds by transferring electrons between atoms
Answer:
1
Explanation:
ionic is transfer of electrons from metal to non metal while covalent is sharing electrons between two non metals
Answer:
It would have to be the first one
Explanation:
plzzz help me i promise will mark u brainiest
Answer:
d) water
Explanation:
Answer:
C) sodium chloride
A rock that has a mass if 180 grams dropped in a graduated cylinder that was originally filled to 52ml; it now reads 62ml. What is the density of this object
Answer:
18 g/mLExplanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\[/tex]
volume = final volume of water - initial volume of water
volume = 62 - 52 = 10 mL
From the question we have
[tex]density = \frac{180}{10} \\ [/tex]
We have the final answer as
18 g/mLHope this helps you
What first happens When a star begins to run out of fuel
Answer: The star's core shrinks, and it becomes a white dwarf.
19. The reaction 2NOBr (g) → 2 NO (g) + Br2 (g) is a second-order reaction with a rate constant of 0.80 M-1s-1 at 11 °C. If the initial concentration of NOBr is 0.0440 M, the concentration of NOBr after 6.0 seconds is ________. A) 0.0276 M B) 0.0324 M C) 0.0363 M D) 0.0348 M E) 0.0402 M
Answer:
(C)The concentration of NOBr after 6 seconds is 0.0363
Explanation:
The second order equation is given by
[tex]\frac{1}{R} = KT+\frac{1}{Ro}[/tex]
k= rate constant= 0.8[tex]M^-1s^-1[/tex]
T= time = 6s
Ro= initial concentration = 0.044
[tex]\frac{1}{R}[/tex] = 0.8*6+ [tex]\frac{1}{0.044}[/tex]
[tex]\frac{1}{R}[/tex] = 27.53
R= 1/27.53 = 0.0363
The salts you tested were held together by ionic bonds. The compounds were made of two types of ions, positive and negative, that were attracted to each other because of their opposite charges. Some ionic bonds take more energy to break. Based on your investigation, which compounds have bonds that require the most energy to break?
A.
an ionic compound that completely dissolves in water, forming many ions
B.
an ionic compound that partially dissolves in water, forming some ions
C.
an ionic compound that does not dissolve in water, and thus does not form any ions
C. an ionic compound that does not dissolve in water, and thus does not form any ions.
Water breaks the ionic bond by hydrogen bonding, as, water itself has a more ionic bond and is polar in nature. Many other solvents such as kerosene and petrol are not capable of breaking the ionic bond. Hence, can not dissolve them, and they all have covalent bonds and which are non-polar in nature.The strength of a single covalent bond requires more energy to break than a single ionic bond. The weakest of the intramolecular bonds or chemical bonds is the ionic bond.Therefore, more energy is required to break the an ionic compound that does not dissolve in water since it will not have the ionic bonds in it.
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What effect does the pH of water have on radish seed germination?
PLEASE HELP!!
How does one determine an empirical formula from a percent composition?
A. Convert mass percents to moles and then use the moles as
subscripts in the formula
B. Convert mass percents to grams and then divide by the smallest
gram value to find subscripts
C. Convert mass percents to moles and then divide by the smallest
mole value to get subscripts
D. Convert mass percents to grams and then divide by the smallest
mass percent value to find subscripts
two students are working together to build a birdhouse. Student 1 applies a force of 10 N to a wooden board in order to slide it across the table to student 2. If the force of fraction resisting the student ´s push is 4 N, what is the net force acting on the board?
Answer:
6
Explanation:
if there is 10n and the friction is 4n on the table then it is 6n.
i hope this helps you! :)
What hold's the nucleus together in an atom?
Which of the following has potential energy? (A child swinging on a play set a book on a table a ball rolling down a hill a car driving down the road)
Answer:
book on a table
Explanation:
potential energy is stored energy
also mark brainliest
Answer:
A child Swinging on a play
Explanation:
Because The potential Energy is about doing something The Defference about Kinetic Energy are A Things That not move before you moved it
Which of the following elements is not a diatomic molecule?
O carbon
O nitrogen
O chlorine
O hydrogen
Which metal would form a stronger metallic bond?
A.sodium
B.tungsten
C.strontium
D.lithium
Answer:
c
Explanation:
Which period on the periodic table do we start to encounter P subshells?
Answer:
There are 4 subshells, s, p, d, and f. Each subshell can hold a different number of electrons. The n number determines how many of the subshells make up the shell. For example, the 1st shell is made up of 1 subshell, s.
Explanation:
hope this helps...
Answer:
i wasn't getting what your question is so this is it
If a compound begins with a metal, it most likely is a _______ compound
metallic
molecular
covalent
ionic
-and why?
Answer:
Metallic compound
Explanation:
Metallic compound -
A metallic compound refers to the species having at least one metal, is known as a metallic compound.
In general a metallic compound consists of two ions, a positive ion or the cation, is is basically a metal, and,
a negative ion or an anion, which is a non - metal.
Hence, from the given statement of the question,
The correct answer is - metallic compound.
What is the name of a compound having the formula Al2O3? (5 points)
1) Aluminum peroxide
2) Aluminum ozone
3) Aluminum oxygen
4) Aluminum oxide
Answer:
4) Aluminum Oxide
Explanation:
Answer:
Aluminum Oxide
Explanation:
:)
A triple bond has _____
shared electrons.
8
4
2
6
Answer:
8
Explanation:
What helps skin repair itself after it is cut?
Question 6 options:
interphase
photosynthesis
mitosis
Answer:
The answer is mitosis.
Explanation:
The symbol P represents the element phosphorus. This element’s atomic number is 15. How many protons and electrons are in a P–3 ion?
15 protons and 3 electrons
12 protons and 15 electrons
15 protons and 18 electrons
18 protons and 15 electrons
The number of proton will be 15 and number of electron will be 18.
What is proton?
In the nuclei of atoms, the proton is just a basic electrically charged particle with neutrons. The p symbol is used to represent it.
What is electron?
The electron is just a subatomic particle with a negative electric charge. It will find easily in the surrounding nucleus. They are assumed to be elementary particles.
Calculation of number of proton and number of neutron shown below:
It is given that the atomic number of phosphorus is 15 . After adding three more electrons in the outermost orbital of the phosphorus atom , new atomic number will be 18.
The atomic mass of the phosphorus = 31.
The number of proton = number of electron = atomic number
So, the number of proton = 15
Due to gaining 3 electrons , the number of electrons will be 15+3 = 18
Therefore, the number of proton will be 15 and number of electron will be 18.
To know more about proton and electron.
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