In Young's double slit experiment, the phase difference between the light waves reaching third bright fringe from the central fringe will be (λ =6000 Å )
|
(a) Zero |
(b) 2π |
(c) 4 π |
(d) 6 π |
(d) 6 π
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At the time of total solar eclipse, the spectrum of solar radiation would be
|
(a) A large number of dark Fraunhofer lines |
|
(b) A less number of dark Fraunhofer lines |
|
(c) No lines at all |
|
(d) All Fraunhofer lines changed into brilliant colours |
A capacitor of capacity 
is charged upto V volt and then connected to an uncharged capacitor of capacity 
. Then final potential difference across each will be
|
(a) |
(b) |
(c) |
(d) |
In above question the energy of the characteristic X-rays given out is
|
(a) Less than 40 keV |
(b) More than 40 keV |
(c) Equal to 40 keV |
(d) ≥ 40 keV |
If 
what is the temperature of inversion
|
(a) - |
(b) + |
(c) - |
(d) + |
The electric field in a region is radially outward with magnitude E = 
. The charge contained in a sphere of radius 
centered at the origin is
|
(a) |
(b) |
(c) |
(d) |
The minimum energy required to excite a hydrogen atom from its ground state is
|
(a) 13.6 eV |
(b) -13.6 eV |
(c) 3.4 eV |
(d) 10.2 eV |
