Which of the following represents the correct set of the four quantum numbers of a 4d electron?

Magnetic quantum number for last electron in sodium atom is equal to 

Bohr’s model can explain

Which of the recent developments has proved the existence of atoms?

Threshold energy is also called: 

If numerical value of mass and velocity are equal then de Broglie wavelength in terms of K.E. is:

Highest electron probability in 1s orbital exists at a point in the vicinity of:

Number of waves made by a Bohr electron in one complete revolution in its fourth orbit is:

If the speed of electron in the Bohr’s first orbit of hydrogen atom is x, the speed of the electron in the third Bohr’s orbit is:

The ionization potential of hydrogen atom is 13.6 eV. The energy required to remove an electron from the n = 2 state of hydrogen atom is:

One energy difference between the states n = 2 and n = 3 is E eV, in hydrogen atom. The ionization potential of H atom is:

A photon of 300 nm is absorbed by a gas and then reemits two photons. One reemitted photon has wavelength 496 nm, the wavelength of second reemitted photon is: 

The highest excited state that unexcited hydrogen atom can reach when they are bombarded with 12.2 eV electron is:

The approximate quantum number of a circular orbit of diameter, 20.6 nm of the hydrogen atom according to Bohr’s theory is:

The maximum wavelength of light that can excite an electron from first to third orbit of hydrogen atom is:

The work function for a metal is 4 eV. To emit a photo electron of zero velocity from the surface of the metal, the wavelength of incident light should be: 

The total energy of the electron in the hydrogen atom in the ground state is –13.6 eV. The KE of this electron is:

In an atom two electrons move around the nucleus in circular orbits of radii R and 4R. The ratio of the time taken by them to complete one revolution is: 

The ratio of the radius of the orbit for the electron orbiting the hydrogen nucleus to that of an electron orbiting a deuterium nucleus is: