Radiation of λ = 155 nm was irradiated on Li (work function = 5eV) plate. The stopping potential (in eV) is.

Increasing order of magnetic moment among the following species is __________ .

Na⁺, Fe⁺³, Co²⁺, Cr⁺²

If in the hydrogen atom P.E. at ∞ is choosen to be 13.6 eV then the ratio of T.E. to K.E. for 1^st orbit of H-atom is __________ .

The light radiations with discrete quantities of energy are called ___________ .

The ratio of the energy of a photon of 2000 Å wavelength radiation to that of 4000 Å radiation is

The energy of electron is maximum at :

Which electronic level would allow the hydrogen atom to absorb a photon but not to emit a photon:

The third line in Balmer series corresponds to an electronic transition between which Bohr's orbits in hydrogen :

The orbital angular momentum of an electron in 2s orbital is :

Which quantum number is not related with Schrodinger equation :

The shortest wavelength of He atom in Balmer series is x, then longest wavelength in the Paschene series of Li⁺² is :

An electron in a hydrogen atom in its ground state absrobs energy equal to the ionisation energy of Li⁺². The wavelength of the emitted electron is

An electron, a proton and an alpha particle have kinetic energies of 16E, 4E and E respectively. What is the qualitative order of their de-Broglie wavelengths?

Given ΔH for the process Li(g) → Li⁺³(g) + 3e^- is 19800 kJ/mole & IE₁ for Li is 520 then IE₂ & IE₃ of Li⁺ are respectively (approx, value) :

The ratio of difference in wavelengths of 1st and 2nd lines of Lyman series in H-like atom to difference in wavelength for 2nd and 3rd lines of same series is :

If radius of second stationary orbit (in Bohr's atom) is R. Then radius of third orbit will be

The ratio of wave length of photon corresponding to the α-line of lyman series in H-atom and β-line of Baimer series in He⁺ is

Three energy levels P, Q, R of a certain atom are such that E_P < E_Q < E_R. If λ₁, λ₂, and λ₃, are the wave length of radiation corresponding to transition R → Q : Q → P and R → P respectively. The correct relationship between λ₁, λ₂ and λ₃ is

The Value of (n₂ + n₁) and for He⁺ ion in atomic spectrum are 4 and 8 respectively. The wavelength of emitted photon when electron jump from n₂ to n₁ is

Number of possible spectral lines which may be emitted in bracket series in H atom if electrons present 9^th excited level returns to ground level, are

The first use of quantum theory to explain the structure of atom was made by :

The wavelength associated with a golf ball weighing 200g and moving at a speed of 5m/h is of the order:

The longest wavelength of He⁺ in Paschen series is "m", then shortest wavelength of Be³⁺ in Paschen series is (in terms of m) :

What is uncertainity in location of a photon of wavelength 5000 Å if wavelength is known to an accuracy of 1 pm?

Consider the following nuclear reactions involving X & Y.

X → Y + ₂He⁴                      Y → ₈O¹⁸ + ₁H¹

If both neutrons as well as protons in both the sides are conserved in nuclear reaction then moles of neutrons in 4.6 gm of X :

Electromagnetic radiations having λ = 310 Å are subjected to a metal sheet having work function = 12.8 eV. What will be the velocity of photoelectrons with maximum Kinetic energy.

Assuming Heisenberg Uncertainity Principle to be true what could be the miniumum uncertainity in de–Broglie wavelength of a moving electron accelerated by Potential Difference of 6V whose uncertainity in position is 7/22 n.m.

A 1-kW radio transmitter operates at a frequency of 880 Hz. How many photons per second does it emit -

The value of Bohr radius of hydrogen atom is -

On the basis of Bohr's model, the radius of the 3rd orbit is -