In an experiment to determine the e/m value for an electron using Thomson's method the electrostatic deflection plates were 0.01 m apart and had a potential difference of 200 volts applied. Then the electric field strength between the plates is

(1)                           (2)

(3)                           (4)

Concept Questions :-

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

Difficulty Level:

Which of the following spectral series in hydrogen atom gives spectral line of 4860 $\stackrel{0}{A}$?

(1) Lyman          (2) Balmer         (3) Paschen             (4) Brackett

Concept Questions :-

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

Difficulty Level:

Hydrogen $\left({}_{1}H_{1}\right)$, Deuterium $\left({}_{1}H_{2}\right)$, singly ionised Helium ${\left({}_{2}H{e}^{4}\right)}^{+}$ and doubly ionised lithium ${\left({}_{3}L{i}^{6}\right)}^{++}$ all have one electron around  the nucleus. Consider an electron transition from n = 2 to n = 1. If the wave lengths of emitted radiation are  and ${\lambda }_{4}$ respectively then approximately which one of the following is correct [JEE (Main) 2014]

(1) $4{\lambda }_{1}=2{\lambda }_{2}=2{\lambda }_{3}={\lambda }_{4}$                  (2) ${\lambda }_{1}=2{\lambda }_{2}=2{\lambda }_{3}={\lambda }_{4}$

(3) ${\lambda }_{1}={\lambda }_{2}=4{\lambda }_{3}=9{\lambda }_{4}$                    (4) ${\lambda }_{1}=2{\lambda }_{2}=3{\lambda }_{3}={\lambda }_{4}$

Concept Questions :-

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

Difficulty Level:

To explain his theory, Bohr used

(1) conservation of linear momentum

(2) conservation of angular momentum

(3) conservation of quantum  frequency

(4) conservation of energy

Concept Questions :-

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

Difficulty Level:

The minimum wavelength of X-rays produced by electrons accelerated by a potential difference of V volt is equal to

(1) $\frac{eV}{hc}$               (2) $\frac{eh}{cV}$               (3) $\frac{hc}{eV}$               (4) $\frac{cV}{eh}$

Concept Questions :-

X-ray
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

The graph between the square root of the frequency of a specific line of the characteristic spectrum of X-rays and the atomic number of the target will be:

(1)

(2)

(3)

(4)

Concept Questions :-

X-ray
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

The wavelength of ${K}_{\alpha }$ X-rays for lead isotopes  respectively. Then

(1) ${\lambda }_{1}={\lambda }_{2}>{\lambda }_{3}$                         (2) ${\lambda }_{1}>{\lambda }_{2}>{\lambda }_{3}$

(3) ${\lambda }_{1}<{\lambda }_{2}<{\lambda }_{3}$                         (4) ${\lambda }_{2}={\lambda }_{1}={\lambda }_{3}$

Concept Questions :-

X-ray
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

which of the following is positively charged?

a.

b.

c.

d.  $\mathrm{X}-\mathrm{rays}$

Concept Questions :-

X-ray
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

The X-ray beam can be detected by

a.  Magnetic field

b.  Electric field

c.  Both (a) and (b)

d.  None of these

Concept Questions :-

X-ray
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

A X-ray tube operates at an accelerating potential of 20 kV. Which of the following wavelength will be absent in the continuous spectrum of X-rays?

a.  12 pm

b.  75 pm

c.  65 pm

d.  95 pm

Concept Questions :-

X-ray