What will be the angular width of central maxima in Fraunhoffer diffraction when light of wavelength 6000 
is used and slit width is 12
|
(a) 2 rad |
(b) 3 rad |
(c) 1 rad |
(d) 8 rad |
(c) 1 rad
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On increasing the plate separation of a charged condenser, the energy
|
(a) Increases |
(b) Decreases |
(c) Remains unchanged |
(d) Becomes zero |
With respect to air critical angle in a medium for light of red colour [
is q. Other facts remaining same, critical angle for light of yellow colour [
] will be
|
(a) θ |
(b) More than θ |
(c) Less than θ |
(d) |
The clear sky appears blue because:
A hydrogen like atom of atomic number Z is in an excited state of quantum number 2n. It can emit a maximum energy photon of 204 eV. If it makes a transition to quantum state n, a photon of energy 40.8 eV is emitted. The value of n will be
|
(a) 1 |
(b) 2 |
(c) 3 |
(d) 4 |
and 
are the focal lengths of a convex lens for violet and red light respectively and 
and 
are the focal lengths of a concave lens for violet and red light respectively, then
|
(a) |
(b) |
|
(c) |
(d) |
