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?

Which of the following electronic transition occurs in H-spectrum having same wavelength as in ${\mathrm{He}}^{+}$ ion spectrum when electron jumps from third excited state to first excited state.

How many maximum line are observed in emission spectrum, if only two hydrogen atoms are present in the sample and electron in both atoms makes electronic transition from $\mathrm{n}=4 \mathrm{to} \mathrm{n}=1$?(Both electrons must follow different path)

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 _____.

Find the number of spectral lines in Paschen series emitted by atomic $\mathrm{H}$, when electron is excited from ground state to $7^{\text{th }}$energy level and returns back.

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

The total number of spectral lines observed when electron returns from the $6^{\mathrm{th}}$ shell until the $2^{\mathrm{nd}}$ shell in hydrogen atom is

An electron in a hydrogen like species is in the excited state ${\mathrm{n}}_2$. The wavelength for the transition from ${\mathrm{n}}_2$ to ${\mathrm{n}}_1=2$ is $48.24 \mathrm{nm}$. The corresponding wavelength for the transition ${\mathrm{n}}_2$ to ${\mathrm{n}}_1=3$ is $142.46 \mathrm{nm}$. Find value of ${\mathrm{n}}_2$ and $\mathrm{Z}$ and report the $\mathrm{H}$ like atom.

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 $\mathrm{x}+\mathrm{y}$.

Discuss the principle of UV-visible spectroscopy.

Define continuous spectrum.

What is the main difference between emission spectrum and absorption spectrum?