How does density of the medium affect the speed of a wave?

Which description best explains a molecular bonding?

poizon [28]

Explanation:

Which description best explains a molecular bonding? Shares electrons

A covalent bond is also known also known as molecular bonding because sharing of electrons occur between two or more atoms.

Molecular bonds are formed between two or more atoms having zero or very small electronegativity difference between them.
This bond type exists between molecules of non-metals.
Each of the atom tends to share the valence electrons in their outer energy levels to be able to mimic the noble gas structure.
This bond type results in formation of molecules.

Learn more:

Covalent bonds brainly.com/question/6029316

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Isotopes of the same elements always have the same Z-number

Isotopes of an element have the same electronic configuration hence they have the same chemical properties.

isotopy is the existence of two or more atoms of the same element having the same atomic number but different mass numbers.
This is due to the differences in the number of neutrons in their various nuclei.

A- number is the mass number or atomic mass number of an atom.

Z-number is the atomic number of an atom

Isotopes have the same atomic number.

Learn more:

Isotopes brainly.com/question/4551913

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Some of the heavy particles bounced off the foil, because there is a dense, positive area in the atom.

Rutherford performed an experiment that gave that atomic model a significant leap.
He found out most alpha particles passed through the foil while a few of them deflected back.
He proposed that an atom is made up of a small positively charge center where nearly all the mass is concentrated.

Learn more:

Rutherford brainly.com/question/1859083

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Burning paper

A chemical change is one in which a new kind of matter is formed.
Chemical changes are always accompanied by energy changes which can be absorption or evolution.
These processes are not easily reversible.
It involves a change in mass
It requires considerable amount of energy.

When a paper is burnt, it turns to ashes. Ashes cannot be turned back into a paper. This is a chemical change.

Learn more:

Chemical change brainly.com/question/9388643

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It remains the same

When the number of neutrons in an atom increases, the atomic number stays the same.

The atomic number is the number of protons in an atom.
Protons are positively charged particles in the nucleus of an atom.
When the number of neutrons changes, the mass number changes.
Neutrons have no effect on the number of protons in an atom.
They are both sub-atomic particles with electrons

Learn more:

Atomic number brainly.com/question/5425825

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Equal number of protons and electrons

Protons are the positively charged particles in atom. Electrons are the negatively charged particles in an atom.

Every atom is electrically neutral.
Electrical neutrality is achieved when the number of protons and electrons are the same.
In atoms, this number is the same.
If the number differs, such an atom is called an ion.

Learn more:

Cations and anions brainly.com/question/4223679

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11 electrons

In a neutral atom, the number of protons and electrons are the same.

Protons are the positively charged particles in an atom.
Electrons are the negatively charged particles in an atom.
Neutrons do not carry any charges in an atom.
A charged atom is an atom that has lost or gained electrons.
In a neutral atom, the number of protons and electrons are the same.

Learn more:

Cations and anions brainly.com/question/4223679

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Thomson D) Electrons

Rutherford B) Nucleus

Bohr C) Electron energy levels

Schrodinger A) Electron cloud and orbitals

J.J Thomson experimented on gas discharge tubes and this led to the discovery of electrons as a subatomic particle. He called the particles cathode rays.
Ernest Rutherford performed the gold foil experiment that gave the modelling of the atom a significant boost. He found that most of the alpha particles passed through the foil while a few of them deflected back. To explain this, he suggested that an atom is made up of a positively charged center where nearly all the mass is concentrated.
Neil Bohr suggested that the extranuclear space is made up of electrons in specific spherical orbits. Electrons move round the nucleus in certain permissible orbits called energy levels.
Erwin Schrodinger formulated the wave equation for electrons. He suggested that the region of maximum probability of where n electron is located is referred to as an electron cloud or orbital.

Learn more:

Nells Bohr brainly.com/question/4986277

Rutherford brainly.com/question/1859083

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3 0

3 years ago

At one instant of time a rocket is traveling in outer space at 2500m/s and is exhausting fuel at a rate of 100 kg/s. If the spee

lawyer [7]

Thrust is a reaction force described quantitatively by Newton's third law. When a system expels or accelerates mass in one direction, the accelerated mass will cause a force of equal magnitude but opposite direction on that system. Mathematically can be written as,

$T = v\frac{dm}{dt}$

Here,

v = speed of the exhaust gases measured relative to the rocket.

$\frac{dm}{dt}$ = Rate of change of mass with respect to time

Our values are given as,

$v = 1500m/s$

$\frac{dm}{dt} = 100kg/s$

Replacing we have that

$T = 1500*100$

$\therefore T = 1.5*10^5N$

7 0

3 years ago

A satellite is put into an orbit at a distance from the center of the Earth equal to twice the distance from the center of the E

Sveta_85 [38]

Answer:

995 N

Explanation:

Weight of surface, w= 4000N

Gravitational constant, g, is taken as 9.81 hence mass, m of surface is W/g where W is weight of surface

m= 4000/9.81= 407.7472

Using radius of orbit of 6371km

The force of gravity of satellite in its orbit, $F=\frac {GMm}{(2r)^{2}}=\frac {GMm}{4(r)^{2}}$

Where $G=6.67*10^{-11}$ and $M=5.94*10^{24}$

$F=\frac {(6.67*10^{-11}*5.94*10^{24}*407.7472)}{4*({6.371*10^{6}m)}^{2}}$

F= 995.01142 then rounded off

F=995N

6 0

3 years ago

A particle executes simple harmonic motion with an amplitude of 2.00 cm. At what positions does its speed equal one fourth of it

White raven [17]

Answer:

The positions are 0.0194 m and - 0.0194 m.

Explanation:

Given;

amplitude of the simple harmonic motion, A = 2.0 cm = 0.02 m

speed of simple harmonic motion is given as;

$v = \omega \sqrt{A^2-x^2}$

the maximum speed of the simple harmonic motion is given as;

$v_{max} = \omega A$

when the speed equal one fourth of its maximum speed

$v =\frac{v_{max}}{4}$

$\omega\sqrt{A^2-x^2} = \frac{\omega A}{4} \\\\\sqrt{A^2-x^2}= \frac{A}{4}\\\\A^2-x^2 = \frac{A^2}{16} \\\\x^2 = A^2 - \frac{A^2}{16} \\\\x^2 = \frac{16A^2 - A^2}{16} \\\\x^2 = \frac{15A^2}{16} \\\\x= \sqrt{\frac{15A^2}{16} } \\\\x = \sqrt{\frac{15(0.02)^2}{16} }\\\\x = 0.0194 \ m \ \ or\ - 0.0194 \ m$

Thus, the positions are 0.0194 m and - 0.0194 m.

8 0

3 years ago

What is the operating life time of a PV Module?

julia-pushkina [17]

Answer:

The industry standard life span is about 25 to 30 years, and that means that some panels installed at the early end of the current boom aren't long from being retired is the operating life time of a PV module .

5 0

2 years ago