In Young's double slit experiment, the distance between sources is 1 mm and distance between the screen and source is 1 m. If the fringe width on the screen is 0.06 cm, then λ =
|
(a) 6000 Å |
(b) 4000 Å |
(c) 1200 Å |
(d) 2400 Å |
(a) 6000 Å
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Two charge + q and -q are situated at a certain distance. At the point exactly midway between them
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(a) Electric field and potential both are zero |
|
(b) Electric field is zero but potential is not zero |
|
(c) Electric field is not zero but potential is zero |
|
(d) Neither electric field nor potential is zero |
Which arrangement of four identical resistances should be used to draw maximum energy from a cell of voltage V
|
(a)
|
(b)
|
|
(c)
|
(d)
|
Cathode rays consist of
|
(a) Photons |
(b) Electrons |
(c) Protons |
(d) α -particles |
The potential barrier, in the depletion layer, is due to
|
(a) Ions |
(b) Holes |
(c) Electrons |
(d) Both (b) and (c) |
The electron in a hydrogen atom makes a transition 
, where 
and 
are the principal quantum numbers of the two states. Assume the Bohr model to be valid. The time period of the electron in the initial state is eight times that in the final state. The possible values of n1 and n2 are
|
(a) |
(b) |
(c) |
(d) |
