The velocity of an electron in the second orbit of sodium atom (atomic number = 11) is v. The velocity of an electron in its fifth orbit will be
(a) v            (b) $\frac{22}{5}v$
(c) $\frac{5}{2}\mathrm{v}$        (d) $\frac{2}{5}\mathrm{v}$

Concept Questions :-

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

Difficulty Level:

The absorption transitions between the first and the fourth energy states of hydrogen atom are 3. The emission transitions between these states will be
(a) 3              (b) 4
(c) 5              (d) 6

Concept Questions :-

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

Difficulty Level:

The ratio of longest wavelength and the shortest wavelength observed in the five spectral series of emission spectrum of hydrogen is
(a) $\frac{4}{3}$             (b) $\frac{525}{376}$
(c) 25             (d) $\frac{900}{11}$

Concept Questions :-

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

Difficulty Level:

In Bohr's model of hydrogen atom, let PE represents potential energy and TE the total energy. In going to a higher level

(a) PE decreases, TE increases

(b) PE increases, TE increases

(c) PE decreases, TE decreases

(d) PE increases, TE decreases

Concept Questions :-

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

Difficulty Level:

According to Bohr's model, the radius of the second orbit of helium atom is
(a) 0.53 Å             (b) 1.06 Å
(c) 2.12 Å             (d) 0.265 Å

Concept Questions :-

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

Difficulty Level:

The fact that photons carry energy was established by

(a) Doppler's effect               (b) Compton's effect
(c) Bohr's theory                   (d) Diffraction of light

Concept Questions :-

Bohr's model of atom

Difficulty Level:

An ionic atom equivalent to hydrogen atom has wavelength equal to 1/4 of the wavelengths of hydrogen lines. The ion will be
(a) ${\mathrm{He}}^{+}$         (b) ${\mathrm{Li}}^{++}$
(c) ${\mathrm{Ne}}^{9+}$        (d) ${\mathrm{Na}}^{10+}$

Concept Questions :-

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

Difficulty Level:

The third line of Balmer series of an ion equivalent to hydrogen atom has wavelength of 108.5 nm. The ground state energy of an electron of this ion will be
(a) 3.4 eV                (b) 13.6 eV
(c) 54.4 eV              (d) 122.4 eV

Concept Questions :-

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

Difficulty Level:

An electron in the n = 1 orbit of hydrogen atom is bound by 13.6 eV energy is required to ionize it is
(a) 13.6 eV                    (b) 6.53 eV
(c) 5.4 eV                      (d) 1.51 eV

Concept Questions :-

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

Difficulty Level:

Hydrogen atom emits blue light when it changes from n = 4 energy level to the n = 2 level. Which colour of light would the atom emit when it changes from the n = 5 level to the n = 2 level
(a) Red                   (b) Yellow
(c) Green                (d) Violet

Concept Questions :-

Spectral series