- A$U _0$
- B$\frac{U_0}{2}$
- ✓$2 U _0$
- D$\frac{ U _6}{4}$
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In a P-type semiconductor, germanium is doped with
|
(a) Boron |
(b) Gallium |
(c) Aluminium |
(d) All of these |
An electric bulb illuminates a plane surface. The intensity of illumination on the surface at a point 2m away from the bulb is 5 phot (lumen/cm2). The line joining the bulb to the point makes an angle of 60o with the normal to the surface. The intensity of the bulb in candela is
|
(a) 40 |
(b) 40 |
(c) 20 |
(d) 40 |
A short magnetic needle is pivoted in a uniform magnetic field of strength 1 T. When another magnetic field of strength
is applied to the needle in a perpendicular direction, the needle deflects through an angle q, where q is
|
(a) 30o |
(b) 45o |
(c) 90o | (d) 60o |
In Young's double slit experiment how many maximas can be obtained on a screen (including the central maximum) on both sides of the central fringe if λ = 2000 and d = 7000
|
(a) 12 |
(b) 7 |
(c) 18 |
(d) 4 |
In any Bohr orbit of the hydrogen atom, the ratio of kinetic energy to potential energy of the electron is
|
(a) 1/2 |
(b) 2 |
(c) -1/2 |
(d) -2 |