Ratio of longest wavelengths corresponding to Lyman and Balmer series in twinge!) spectrum ts

(a)5/27

(b)3/23

(c)7/29

(d)9/31

Concept Questions :-

Spectral series
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

Electron in hydrogen atom first jumps from third exicted state to second exicted state and then from second exicted to the first excited state. The ratio of the wavelengths ${\lambda }_{1}:{\lambda }_{2}$ emitted in the two cases is

(a) 7/5

(b) 27/20

(c) 27/5

(d) 20/7

Concept Questions :-

Bohr's model of atom
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

An electron of a stationary hydrogen atom passes from the fifth energy level to the ground level. The velocity that the atom acquired as a result of photon emission will be

(a)                                (b)

(c)$\frac{25m}{24hR}$                                 (d)$\frac{24m}{25hR}$

(m is the mass of the electron, R Rydberg constant and h Planck's constant)

Concept Questions :-

Bohr's model of atom
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

Monochromatic radiation emitted when electron on hydrogen atom jumps from first excited to the ground state irradiates a photosensitive material. The stopping potential is measured to be 3.57 V.The threshold frequency of the material is:

(a)$4×{10}^{15}Hz$                               (b)$5×{10}^{15}Hz$

(c)$1.6×{10}^{15}Hz$                            (d)$2.5×{10}^{15}Hz$

Concept Questions :-

Bohr's model of atom
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

The transition from the state n=3 to n=1

a hydrogen like atom results in ultraviolet

in the transition from

(a) $2\to 1$

(b) $3\to 2$

(c) $4\to 2$

(d) $4\to 3$

Concept Questions :-

Spectral series
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

The wavelength of the first line of Lyman series for hydrogen atom is equal to that of the second line of Balmer series for a hydrogen-like ion. The atomic number Z of hydrogen-like ion is

(a) 4                                                  (b) 1

(c) 2                                                  (d) 3

Concept Questions :-

Spectral series
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

The energy of a hydrogen atom in the ground state is -13.6 eV. The energy of a ${\mathrm{He}}^{+}$ ion in the first excited state will be

(a) -13.6 eV

(b) -27.2 eV

(c) -54.4 eV

(d) -6.8 eV

Concept Questions :-

Bohr's model of atom
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

An alpha nucleus of energy $\frac{1}{2}m{v}^{2}$ bombards a heavy nuclear target of charge Ze. Then the distance of closest approach for the alpha nucleus will be proportional to

(a) $\frac{1}{Ze}$                              (b) ${v}^{2}$

(c) $\frac{1}{m}$                               (d) $\frac{1}{{v}^{4}}$

Concept Questions :-

Various atomic model
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

The electron in the hydrogen atom jumps from excited state $\left(n=3\right)$ to its ground state $\left(n=1\right)$ and the photons thus emitted irradiate a photosensitive material. If the work function of the material is  the stopping potential is estimated to be (the energy of the electron in the nth state ${\mathrm{E}}_{\mathrm{n}}=-\frac{13.6}{{\mathrm{n}}^{2}}\mathrm{eV}$)

1.                                                2.

3.                                               4.

Concept Questions :-

Bohr's model of atom
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

In a Rutherford scattering experiment when a projectile of charge ${Z}_{1}$ and mass ${M}_{1}$ approaches a target nucleus of charge ${Z}_{2}$ and mass ${M}_{2},$ the distance of closest approach is ${r}_{0}$. The energy of the projectile is

(a) directly proportional to ${M}_{1}×{M}_{2}$

(b) directly proportional to ${Z}_{1}{Z}_{2}$

(c) inversely proportional to ${Z}_{1}$

(d) directly proportional to mass ${M}_{1}$

Concept Questions :-

Various atomic model