Hello candidate,

Here is a List of some of the key important topics which were mainly focused in previous years EMCET question papers-

Bohr's radius and it's principles, schrodinger wave equation, Heisenberg Uncertainty principle, angular momentum, equation for radius and velocity of an electron, principal and azimuthal Quantum numbers, magnetic moment, spin quantum number.

Hope you found it helpful!!

Hello Dear,

The concept originated in 1905 by Albert Einstein's explanation of the photoelectric effect Photon, also called light quantum In physics, a photon is a bundle of electromagnetic energy. It is the basic unit that makes up all light. The photon is sometimes referred to as a "quantum" of electromagnetic energy. Photons are not thought to be made up of smaller particles. They are a basic unit of nature called an elementary particle.

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Hello Aspirant,

Henry Moseley developed his own law named Moseley's Law. This law established a relationship between atomic number of element and frequency of X-rays of that atom.

According to this law, the square root of frequency of X-rays imparted by elements is directly proportional to the atomic number of that element.

I hope this information helps you.

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Hello!!!!

Hope you are doing great!!!!

The question is incomplete .Please make sure you complete the question,you can get to know the answer.You didnot  mention the element in which we have to find the radiation.And also make sure to mention the orbit level then it will be easy to answer,,

Hope it helps!!!

Hello Aspirant,

Matter waves are the waves that are associated with a moving quantum particle. These waves interfere like ordinary waves in space, and the regions where these waves interfere constructively are the most probable regions for the presence of the associated particle.

In phase means that the phase angle of two waves are the same or are in arithematic progression with the common difference.

Hope it helps.

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Hello Aspirant,

Postulates of Bohr's atomic model are described below :-

• Electrons revolve in definite circular around nucleus.
• As long as they revolve, they neither lose nor gain energy. Such orbits are called stationary orbits.
• When an electron jumps from an orbit of higher energy to lower energy it release energy in the form of radiations and vice-versa.
• An angular momentum of revolving electron is an integral multiple of h/2π.

It was propsed by Bohr to explain the stability of atom and the line spectrum of hydrogen atom.

I hope this answer helps you.

For further doubts feel free to ask here.

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Hi Vijay,

Mass number = Number of protons + Number of neutrons

Atomic number = number of protons or number of electrons

Atomic number of zinc = 30 i.e., has 30 electrons.  In dipositive ion 2 electrons are lost, so, 28 electrons are present.

Mass number = 70

70 = 30 + Number of neutrons

Thus number of neutrons in dipositive zinc ion with mass number 70 is 40.

Feel free to ask doubts in the Comment Section.

I hope this information helps you.

Good Luck!

Hello,

As He+ becomes H after removal of electron and probable of finding an electron by multiplying the square of the wave function of the spherical is orbital . so the most probable radius is 26.5 pm as it sums up when surface area is being used instead of volume .

Hope this helps you .

Bohr’s model includes a small positively charged nucleus in center which is  surrounded by negatively charge electrons moving around the nucleus in orbits. Bohr model showed that the energy of an electron was inversely dependent on the distance between the center(nucleus) and the electron.

Postulates of Bohr's Model of an Atom:

• In an atom negative electrons revolve around positive charge nucleus in a fix circular path which are called as orbits.
• Each orbit has a fixed energy and these circular orbits are known as orbital shells.
• The energy level of these orbits are represented using quantum numbers which are integers(n=1,2,3,4...). This range of quantum number starts from nucleus with n=1 having the lowest energy level. The orbits n=1, 2, 3, 4… are assigned as K, L, M, N…. shells and when an electron attains the lowest energy level it is said to be in the ground state.
• The electrons in an atom move from a lower energy level to a higher energy level by gaining the required energy and an electron moves from a higher energy level to lower energy level by losing energy.

Hope this helps you,

Thank You.

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HI there,

Could please mention for which exam you want to take the mock tests,

kindly mention the exam name so it is better to answer you clearly