Structure of At...

in the Thomson Model of Atom

Photoelectric effect established that light

Consider the ground state of Cr atom (Z = 24). The numbers of electrons with the azimuthal quantum numbers, l = 1 and 2 are, respectively

The de Broglie wavelength ratio of two electron waves is 1 : 3. The ratio of kinetic energies of electrons will be:

Correct expression for mass number A is

Mg²⁺ is isoelectronic with

If x is the radius of the first orbit of hydrogen atom, then the de Broglie wavelength of the third orbit is:

Rutherford’s α–particle scattering experiment supported the discovery of

What is the minor axis length in the L-shell of the hydrogen atom?

An ion with mass number 37 possesses one unit negative charge. If it contains 11.1% more zero charge subatomic particles than the negative charge subatomic particles, the symbol of ion is

Cathode rays or cathode ray particles are

If an electron is moving with a kinetic energy of 3.96 x10^-34 J, calculate its de Broglie wavelength.

(Given: m = 9.1 x 10^-31 kg and h = 6.6 x 10^-34 kgm²s^-1)

According to Dalton’s atomic theory

The threshold frequency of a metal is 2.8 eV. If the radiation 2500  falls on the metal, then the kinetic energy of the emitted electron is:

An element 'X' has 16 electrons. Calculate the number of electrons present in the M-shell of the element in X^2- state.

An electron revolves around the nucleus with a velocity of 3.05 x 10⁷ ms^-1. What is the wavelength of the electron?

The radial distance between two peaks in the radial probability distribution curve of 2s-orbital is

If the speed of a tennis ball is measured as 0.76 ms^-1 and mass as 35 g, then find the uncertainty in position.

The ratio of the radii of the 3^rd orbits of He⁺ and Li²⁺ is:

Charge on the electron was determined by

Isobars are the atoms with

When an electric discharge is passed through gaseous hydrogen, the H₂ molecules dissociate and the energetically excited hydrogen atoms produced emit electromagnetic radiation of discrete frequencies. The hydrogen spectrum consists of

A 100-watt bulb emits light having wavelength 5 x 10^-7 m. Calculate the number of photons emitted per second by the bulb.

Emission spectrum of a material results from the material's (atom or molecules)

A gas absorbs a photon having wavelength 400 nm and then re-emits two photons. If the wavelength of one photon is 800 nm, then the wavelength of the second photon will be:

The wave number of line in the Paschen series of hydrogen emission spectrum is:

Absorption spectrum, seen as dark lines in an otherwise continuous spectrum, for a given material results from the material's (atom or molecules)

The relation between the energies of two different radiations whose wavelengths are 800 nm and 400 nm is:

The total energy of an electron in the first excited state of the hydrogen atom is about −3.4 eV. What is the kinetic energy of the electron in this state?

Correct expression for all series of lines in the hydrogen spectrum is (n1 = 1, 2, 3... and n2 = n1 + 1, n1 +2, ... , and is the wavenumber)