An electron of mass m and charge e is accelerated from rest through a potential difference V in vacuum. The final speed of the electron will be
|
(a) |
(b) |
(c) |
(d) 2eV/m |
(c) 
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Blue colour of sky is due to:
Assertion : Short wave bands are used for transmission of ratio waves to a large distance
Reason : Short waves are reflected by ionosphere
|
(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
|
(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
|
(c) If assertion is true but reason is false. |
| (d) If assertion is false but reason is true. |
A light wave is incident normally over a slit of width 24 
. The angular position of second dark fringe from the central maxima is 30o. What is the wavelength of light
|
(a) 6000 Å |
(b) 5000 Å |
(c) 3000 Å |
(d) 1500 Å |
In an interference experiment, the spacing between successive maxima or minima is (Where the symbols have their usual meanings)
|
(a) |
(b) |
(c) |
(d) |
In Young’s double slit experiment, the distance between the two slits is made half, then the fringe width will become
|
(a) Half |
(b) Double |
(c) One fourth |
(d) Unchanged |
