What is the difference in the origin of cathode rays and anode rays?

Which of the following will not show deflection from the path on passing through an electric field? Proton, cathode rays, electron, neutron

What is the difference between atomic mass and mass number?

An atom having atomic mass number 13 has 7 neutrons. What is the atomic number of the atom?

What do you mean by saying that energy of the electron is quantised?

What is the experimental evidence in support of the idea that electronic energies in an atom are quantised?

Why are Bohr's orbits called stationary states?

Why did Heisenberg replace the concept of definite orbits by the concept of probability?

Can we apply Heisenberg's uncertainty principle to a stationary electron? why or why not?

Calculate energy of one mole of photons of radiation whose frequency is 5 x 10¹⁴ HZ.

Lifetimes of the molecules in the excited states are often measured by using pulsed radiation source of duration nearly in the nano second range. If the radiation source has the duration of 2 ns and the number of photons emitted during the pulse source is 2.5 × 10¹⁵, calculate the energy of the source.

How does the Bohr theory of the hydrogen atom differ from that of schrodinger?

How long would it take a radio wave of frequency, 6 x 10³ s^-1 to travel from Mars to the Earth, a distance of 8 x 10⁷ km?

What kind of information about an electron in an atom is obtained from its wave function?

Calculate wave number of the line having frequency 5 x 10¹⁶ Hz.

Calculate the energy associated with the first orbit of He⁺. What is the radius of this orbit?

What must be the velocity of a beam of electrons if they are to be display a de-Broglie wavelength of \(100\overset { \circ }{ A } \) (mass of electron) 
= \(9.1\times { 10 }^{ -31 }kg,h=6.6\times { 10 }^{ -34 }Js\)?

The velocity associated with a proton moving in a potential difference of 1000 V is 4.37 × 10⁵ ms^–1. If the hockey ball of mass 0.1 kg is moving with this velocity, calcualte the wavelength associated with this velocity.

Write the electronic configuration of \({ 9 }^{ { F }^{ 19 } },{ 16 }^{ { S }^{ 32 } }and \ { 18 }^{ { Ar }^{ 38 } }\)and then point out the element with A maximum number of unpaired electrons.

How many electrons in an atom may have the following quantum numbers?
(a) n = 4, ms = – ½
(b) n = 3, l = 0

Calculate the frequency, energy, and wavelength of radiation corresponding to the spectral line of lowest frequency in Lyman series in the spectra of hydrogen atom. Also, calculate the energy for the corresponding line in the spectra of Li²⁺. (R = 1.09678 x 10⁷ m^-1 , c = 3 x 10 ⁸ ms^-1 , h = 6.625 x 10^-34 Js).
v = 2.47 x 10¹⁵ s^-1 , \(\lambda \) = 121.6 nm

Which atoms are indicated by the following configuration?
a) [He]2s¹ 
b) [Ne] 3s²3p³
c) [Ar]4s²3d¹