Structure of atom practice · Mixed difficulty

Which of the following energy level may bring absorption of photon but never emission of photon?

What is the ratio of maximum $\lambda$ of Lyman and Balmer series

The quantum number not obtained from the schrodinger wave equation is

The shape of an orbital is given by the quantum number

The velocity of a photon is:

The atom with lowest atomic number that has a ground state (EC) of $(n-1) d^6 n s^2$ is in the

The de Broglie's wavelength of electron present in first Bohr orbit of $\mathrm{H}$ atom is

In Bohr's model of the hydrogen atom, let $r, v$ and $E$ represent the orbit radius, speed of an electron and the total energy of the electron, respectively. Which of following relation is proportional to the orbit number $n$ ?

According to de-Broglie, matter should exhibit dual behaviour, that is both particle and wave like properties. However, a cricket ball of mass $100 \mathrm{~g}$ does not move like a wave when it is thrown by a bowler at a speed of $100 \mathrm{~km} / \mathrm{h}$. Calculate the wavelength of the ball.

The number of protons, neutrons and electrons in ${}_{71}^{175}\mathrm{Lu}$ , respectively, are

Which statement relating to the spectrum of H atom is false?

The angular momentum of an electron in a given stationary state can be expressed as $m_e v r=n \frac{h}{2 \pi}$. Based on this expression an electron can move only in those orbits for which its angular momentum is

The ratio of the radii of the first three Bohr orbits is :

The quantum number of four electrons are given below:
I. $n = 4,\,\,l = 2,\,\,{m_l} = - 2,\,\,{m_s} = - \frac{1}{2}$
II. $n = 3,\,\,l = 2,\,\,{m_l} = 1,\,\,{m_s} = + \frac{1}{2}$
III. $n = 4,\,\,l = 1,\,\,{m_l} = 0,\,\,{m_s} = + \frac{1}{2}$
IV. $n = 3,\,\,l = 1,\,\,{m_l} = 1,\,\,{m_s} = - \frac{1}{2}$
The correct order of their increasing energies will be

A dye absorb light of $\lambda=4530 \mathop {\text{A}}\limits^{\text{o}}$ and then fluorescence of $5080 \mathop {\text{A}}\limits^{\text{o}}$ Assuming that under given conditions $47 \% \mathrm{C}$ absorbed energy is re-emitted out as fluorescence, calculate ratio of quanta emitted out to the number of quanta absorb

If nucleus and atom are considered as perfect spheres with diameters $4 \times 10^{-15} \mathrm{~m}$ and $2 \times 10^{-10}$ $\mathrm{m}$, respectively, then the ratio of the volumes of nucleus and atom should be

In a relative scale the deBrogle wave length of moving neutron at $27^{\circ} \mathrm{C}$ is $\mathrm{y}_1 ; \mathrm{~A}^0$ and the de-Broglees wave length of moving $\mathrm{SO}_2$ molecules at $927^{\circ} \mathrm{C}$ is $\mathrm{y}_2 \mathrm{~A}^0$ then $\left(\frac{\mathrm{y}_1}{\mathrm{y}_2}\right)=$? (Assume that mass of neutron $\&$ proton is same) (mol. Wt of $\mathrm{SO}_2=64$)

Statement I : The amount of light emitted (intensity of radiation) from a black body and its spectral distribution depends only on its temperature
Statement II : When a ray of white light is passed through a prism, the wave with shorter wavelength bends more than the one with a longer wavelength

The ratio of angular momentum of electron in two successive orbits is $a \, (a>1)$ and their difference is $b,$ then $\frac{a}{b}$ is equal to

Which electron transition in a hydrogen atom requires the largest amount of energy?

The total energy in $1^{\text {st }}$ orbit of hydrogen atom is given by

Which of the following expression represent the wave number of spectral lines in Balmer series (if $n$ is the principal quantum number of higher energy level)?

If the shortest wavelength of H-atom in Lyman series is x, the longest wavelength in Balmer series of $\mathrm{H}{\mathrm{e}^ + }$ is

In cathode ray discharge tube experiment, when sufficiently high voltage is applied across the electrodes, current starts flowing through a stream of particles from negative electrode to positive electrodes. These particles are called

Which of the following pairs of ions have the same electronic configuration?

Hydrogen atoms are excited to $n = 4$ state, In the spectrum of emitted radiation, number of lines in the
UV and visible regions are resp.

What is the de-Broglie wavelength (in ${nm}$ ) of an electron in the ground state of hydrogen atom is ?

$\text { [K.E. }=13.6 \,{eV} ; 1 \,{eV}=1.602 \times 10^{-19} {~J} \text { ] }$

Which of the following does not characterise X-rays?

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:

According to Heisenberg uncertainty principle: