An electron initially at rest, is accelerated through a potential difference of 200 volt, so that it acquires a velocity 8.4 
. The value of e/m of electron will be
|
(a) 2.76 |
(b) 1.76 |
(c) 0.76 |
(d) None of these |
(b) 1.76 
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For ferromagnetic material, the relative permeability (
, versus magnetic intensity (H) has the following shape
|
(a)
|
(b)
|
(c)
|
(d)
|
A wire has a resistance of 12 ohm. It is bent in the form of equilateral triangle. The effective resistance between any two corners of the triangle is
|
(a) 9 ohms |
(b) 12 ohms |
(c) 6 ohms |
(d) 8/3 ohms |
Magnifying glass forms:
The wavelength of most energetic X-rays emitted when a metal target is bombarded by 40KeV electrons, is approximately (h = 6.63 
)
|
(a) 300 Å |
(b) 10 Å |
(c) 4 Å |
(d) 0.31 Å |
The Young's experiment is performed with the lights of blue (λ = 4360 Å) and green colour (λ = 5460 Å), If the distance of the 4th fringe from the centre is x, then
|
(a) x (Blue) = x (Green) |
(b) x (Blue) > x (Green) |
(c) x (Blue) < x (Green) |
(d) |
