Spectroscopy - TRB Physics Study Materials

SI NO.	QUESTIONS	ANSWERS
1.	Study of the interactions of electromagnetic radiators with matter is called?	Thermal radiation
2.	Continuous spectrum depends only on the?	Temperature of source
3.	Line spectrum is used to identify the ?	Gas
4.	Band spectra is used to find the?	Molecular structure
5.	Solar spectrum is an example of?	Line Absorption spectrum
6.	A molecule from higher energy state to lower energy states gives rise to?	Molecular spectra
7.	If the molecule is asymmetric the spectrum is?	Rational
8.	The angular momentum of rotating diatomic molecule is?	J(j+1)h and J(j+1)
9.	Most common sources of IR spectroscopy are?	Globar and Nernst glower
10.	The source of the IR spectrometer is?	Globar
11.	This lines having frequencies greater than incident frequency are called?	Anti-stokes lines
12.	LASER is the acronym of?	Light amplification by stimulated emission of radiation
13.	The lines whose frequencies have been modified in Raman effect are called?	Raman lines
14.	Without any external agent the atoms came to ground state is known as?	Spontaneous
15.	The method of producing population in version is?	Pumping
16.	The mixing ratio of Helium and neon is?	1:4
17.	In He-ne laser pumping takes place by?	Powerful radio frequency generator
18.	The method of producing 3D image instead of 2D is?	Holography
19.	Atomic spectrum should be?	Pure line spectrum
20	Of the following the good moderator is?	Graphite
21	The temperature of chromospheres is?	6000K
22	The electronic device which converts are voltage into d.c. voltage is called?	Rectifier
23	Which of the following is most suitable for the core of the electromagnets?	Soft-iron
24	Sound travels fastest in which of the following medium?	Iron
25	The source is at infinity, the shape of the wave front is?	Plane