Modern Physics ( Part 2 ) - TRB Physics Study Materials

SI NO.	QUESTIONS	ANSWERS
1.	The radii of the orbits are in the ratio?	1:4:9:16
2.	When an electron jumps from second, third to first the series is called?	Balmer series
3.	Paschen series is obtained in the region is?	IR
4.	According to sommer feld’s theory the path of the electron is?	Elliptical
5.	In sommerfeld atom model the angular momentum varies from?	0 – (n-1)
6.	According to sommer feld’s atom model for any principle quantum number, there are ‘n’ possible orbits called ?	Sub-orbits and Sub shells
7.	When the electron is nearest to the nucleus its velocity is ?	Maximum
8.	The idea of space quantization leads to an explanation of?	Zeeman effect
9.	The total angular momentum of an atom is the?	Vector sum of orbital angular momentum and spin angular momentum
10.	The orbital quantum number starts from?	0,1,2,3…..(n-1)
11.	The possible values of magnetic orbital quantum number?	l,l-1,l-2…..0,-1,-2…..-1
12.	When a light placed in a magnetic field, the splitting occurs into two are three lines is called?	Normal Zeeman effect
13.	Find the wave length of the photon emitted when the hydrogen atom goes from n=10 state  to ground state?	921
14.	Critical potential for hydrogen is 13.05 V calculate the wave length of the radiation that will be emitted by hydrogen atom when bombarded by an electron of corresponding energy?	951.5
15.	In a crystal , the miller indices of a given plane is 3:2:1 what are the intercepts?	2a,3b,6c
16.	Emission, absorption and interaction of light with mater can?	Quantum theory
17.	During the impact of plastic bodies there is  maximum loss of kinetic energy when ?	E=0
18.	The galvanometer is a device used to?	Indicate current
19.	E.M.F  of a cell is always?	Less than P.D
20	Which one of the waves cannot be polarized?	x-rays
21	The least energy required to eject an electron from an atom is called?	Work function
22	Longitudinal waves do not exhibit?	Polarization
23	Positive rays are?	Positive ions
24	Visible spectrum lies between?	Infrared and ultraviolet rays
25	The intensity of X-rays depends upon?	Velocity of electron