Explanation:
Radiocarbon is produced in the atmosphere as result of collision between fast neutrons and nitrogen nuclei present in the atmosphere.
Nuclear reaction is given as:
7N14 + 0n1 → 6C14 + 1H1
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The area of each plate of a parallel plate capacitor is 
and the distance between the plates is 1mm. It is filled with mica of dielectric 6. The radius of the equivalent capacity of the sphere will be
|
(a) 47.7 m |
(b) 4.77 m |
(c) 477 m |
(d) None of the above |
The line on the earth's surface joining the points where the field is horizontal is
| (a) Magnetic meridian | (b) Magnetic axis | (c) Magnetic line | (d) Magnetic equator |
The ratio of charge to potential of a body is known as
|
(a) Capacitance |
(b) Conductance |
(c) Inductance |
(d) Resistance |
The equivalent resistance between P and Q in the given figure, is
|
(a) 50 W |
(b) 40 W |
(c) 30 W |
(d) 20 W |
Bragg’s law for X-rays is
| (a) d sin θ = 2n λ | (b) 2dsin θ = n λ |
(c) n sin θ = 2 λ d |
(d) None of these |
Two point charges Q and – 3Q are placed at some distance apart. If the electric field at the location of Q is E then at the locality of -3Q, it is
|
(a) - E |
(b) E/3 |
(c) -3E |
(d) -E/3 |
An electron moving towards the east enters a magnetic field directed towards the north. The force on the electron will be directed
|
(a) Vertically upward |
(b) Vertically downward |
|
(c) Towards the west |
(d) Towards the south |
In a beryllium atom, if a0 be the radius of the first orbit, then the radius of the second orbit will be in general
|
(a) |
(b) |
(c) |
(d) |
