Atomic Spectra

The frequency of oscillation of the electric field vector of a certain electromagnetic.wave is  $5\times {10}^{14}$ Hz. What is the frequency of oscillation of the corresponding magnetic field vector and to which part of the electromagnetic spectrum does it belong?

Distinguish between continuous spectrum and dis- continuous spectrum. Give some examples of sources for these spectra. 

What is a fine spectrum? 

What is a continuous spectrum? 

The number of following statement/s which is/are incorrect is ______

A) Line emission spectra are used to study the electronic structure

B) The emission spectra of atoms in the gas phase show a continuous spread of wavelength from red to violet.

C) An absorption spectrum is like the photographic negative of an emission spectrum

D) The element helium was discovered in the sun by spectroscopic method

The wavelength of first line of Paschen series is $\mathrm{\lambda }=720 \mathrm{nm}$. The wavelength of $2\mathrm{nd}$ line of this series is ____.

The wavelength of ${\mathrm{H}}_{\mathrm{\alpha }}$ line Balmer’s series of hydrogen spectrum is $6563{\mathrm{A}}^{\circ }$ . Find the:

Shortest wavelength of Brackett series?

Number of possible spectral lines in the bracket series in hydrogen spectrum when electrons is present in the 9th excited state return to the ground state.

Bright coloured lines separated by dark spaces is called as _____.

What are the frequency and wavelength when electron jumps from $\mathrm{n}=5$ state to $\mathrm{n}=2$ state ?

Electronic transitions in ${\mathrm{Li}}^{2+}$ ions take place from ${\mathrm{n}}_2$ to ${\mathrm{n}}_1$ shell such that: $2{\mathrm{n}}_2+3{\mathrm{n}}_1=18$ and $2{\mathrm{n}}_2-3{\mathrm{n}}_1=6$. The total number of photons emitted when electrons transit to ${\mathrm{n}}_1$ shell is $\mathrm{x}$ (electrons do not fall lower than ${\mathrm{n}}_1$ shell) and number of photons emitted in the Balmer range is $\mathrm{y}$. Find value of $\mathrm{x}+\mathrm{y}$.

What do you mean by an emission spectrum?

Write the names of electromagnetic waves on the basis of their increasing frequencies.

Which of the following is correct?

The Lyman series corresponds to the emission lines of hydrogen atom due to the transitions of the type $\mathrm{n}\to 1(2\to 1,3\to 1,4\to 1$, etc ) where $\mathrm{n}$ is the principal quantum number of the excited state. The ionization energy of the hydrogen atom can be determined by plotting:

Discuss the conditions under which hydrogen gas produces emission spectrum.

For Rydberg's equation, what is the value of ${\mathrm{n}}_1$ and ${\mathrm{n}}_2$ for Pfund series?   

Define Brackett series of hydrogen spectrum.

In the Balmer series of atomic spectra of hydrogen, there is spectral line having wavelength $434.4 \mathrm{nm}$. Calculate the number of higher orbit from which the electron drops to generate this line. $\left(\mathrm{R}=10.97\times {10}^6 {\mathrm{m}}^{-1}\right)$