Structure of atom practice · Mixed difficulty

A node is a surface on which the probability of finding an electron is:

For which species, Bohr's theory does not apply:

The mass defect of the nuclear reaction: ${ }_5 {B}^8 \rightarrow{ }_4 {Be}^8+{e}^{+}$is

The formation of energy bonds in solids are in accordance with

Electron density in the YZ plane of $3{d_{{x^2} - {y^2}}}$ orbital is

Which has highest e/m ratio?

A certain orbital has no angular nodes and two radial nodes. The orbital is

The path of deflection of electron beam is:

The wave number $\left( {\overline V } \right)$ in terms of Rydberg’s constant for an electronic transition between two levels of $L{i^{2 + }}$ ion, whose sum is four and difference is 2 will be

The photoelectric effect occurs only when the incident light has more frequency than a certain minimum:

Which of the following conditions is incorrect for a well behaved wave function $(\psi )$

Which of the following set of quantum numbers represents the highest energy orbital in a multi electron atom ?

If the radius of first Bohr's orbit be ${a_0}$ , then the radius of third Bohr's orbit would be:

The ionisation enthalpy of hydrogen atom is $1.312 \times {10^6}\mathrm{Jmo}{\mathrm{l}^{ - 1}}$. The energy required to excite the electron in the atom from ${n_1} = 1\;\mathrm{to }\;{n_2} = 2$ is

Among the following, the correct statement about cathode ray discharge tube is

In a Hydrogen atom, if the energy of electron in the ground state is $- x\,\,ev,$ then that in the 2nd excited state of $H{e^ + }$ is

The value of Planck’s constant is $6.63 \times {10^{ - 34}}\;\mathrm{Js}.$. The velocity of light is $3.0 \times {10^8}\mathrm{\;m\;}{\mathrm{s}^{ - 1}}.$. Which value is closest to the wavelength in nanometre of a quantum of light with frequency of $8 \times {10^{15}}\mathrm{\;}{\mathrm{s}^{ - 1}}?$

Which consists of particle of matter?

If ‘r’ is the radius of first orbit, the radius of nth orbit of H-atom is given by

Which one of the following set of ions represents a collection of isoelectronic species

The Bohr’s orbit radius for the hydrogen atom (n=1) is approximately 0.53 Å. The radius for the first excited state (n=2) orbit is

The ratio of energy of a photon of $2000{A^0}$ wavelength 396 to that of $4000{A^0}$ 396 is

Assertion: In absorption spectrum, $n_f > n_i$, while in emission spectrum, $n_f > n_i$

Reason: Energy is limited in absorption spectrum, that is, electron moves from lower to higher orbit and energy is absorbed in emission spectrum, because election jumps from higher to lower orbit.

Which of the following pairs are isoelectronic and isotopic.

The number of neutrons in the dipositive zinc ion (A of Zn = 65)

If $p$ is the momentum of the fastest electron ejected from a metal surface after the irradiation of light having wavelength $\lambda ,$ then for 1.5 p momentum of the photoelectron, the wavelength of the light should be
(Assume kinetic energy of ejected photoelectron to be very high in comparison to work function)

The uncertainity in position for a dust particle $m = {10^{ - 11}}g;\,\,\,diameter = {10^{ - 4}}$ cm and velocity $= {10^{ - 4}}\,cm/s$) will be (The error in measurement of velocity is 1%)

Which set of phenomenon shown by the radiation proves the dual nature of radiation?

The radiation having maximum wavelength is

Statement (S): Number of sub-shells in a shell is equal to the number of shell.

Explanation (E): According to Sommerfeld: $\frac{n}{k}=\frac{\text { Length of major axis }}{\text { Length of minor axis }}$