Explanation:
Negative beta decay is given as
$\text{n}\rightarrow\text{p + e}^-+\bar{\text{v}}$
Neutron decays to produce proton, electron and anti-neutrino.
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A planet of mass m moves in an ellipse around the sun of mass 
so that its maximum and minimum distances are 
and 
respectively. The angular momentum of the planet relative to the centre of the sun is
|
(a) |
(b) |
(c) |
(d) |
Two similar spheres having +q and -q charge are kept at a certain distance. F force acts between the two. If in the middle of two spheres, another similar sphere having +q charge is kept, then it experience a force in magnitude and direction as
|
(a) Zero having no direction |
(b) 8F towards +q charge |
|
(c) 8F towards -q charge |
(d) 4F towards +q charge |
The energy required to excite an electron from the ground state of hydrogen atom to the first excited state, is
|
(a) 1.602 |
(b) 1.619 |
(c) 1.632 |
(d) 1.656 |
Due to the earth's magnetic field, charged cosmic ray particles
| (a) Require greater kinetic energy to reach the equator than the poles |
|
(b) Require less kinetic energy to reach the equator than the poles |
| (c) Can never reach the equator |
| (d) Can never reach the poles |
A rectangular loop is being pulled at a constant speed v, through a region of certain thickness d, in which a uniform magnetic field B is set up. The graph between position x of the right hand edge of the loop and the induced emf E will be
(a)
|
(b)
|
(c)
|
(d)
|
In a wave, the path difference corresponding to a phase difference of f is
|
(a) |
(b) |
(c) |
(d) |
A person sees his virtual image by holding a mirror very close to the face. When he moves the mirror away from his face, the image becomes inverted. What type of mirror he is using
|
(a) Plane mirror |
(b) Convex mirror |
(c) Concave mirror |
(d) None of these |
