Explanation:
This is because in heavy nuclei, the $\frac{\text{N}}{\text{Z}}$ ratio becomes larger in order to maintain their stability and reduce instability caused due to the repulsion among the protons. The neutrons exert only attractive short-range nuclear forces on each other as well as on the neighbouring protons, whereas the protons exert attractive short-range nuclear forces on each other as well as the electrostatic repulsive force. Thus, the nuclei with high mass number, in order to be stable, have large neutron to proton ratio $\frac{\text{N}}{\text{Z}}.$
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
In the figure shown, the total resistance between A and B is
|
(a) 12 Ω |
(b) 4 Ω |
(c) 6 Ω |
(d) 8 Ω |
The imaginary line passing through the pole and the center of curvature of the curved mirror is called its _______.
A beam of monochromatic blue light of wavelength 4200Å in air travels in water (μ = 4/3). Its wavelength in water will be
|
(a) 2800 Å |
(b) 5600 Å |
(c) 3150 Å |
(d) 4000 Å |
Electroplating does not help in
|
(a) Fine finish to the surface |
(b) Shining appearance |
|
(c) Metals to become hard |
(d) Protect metal against corrosion |
The charge on a particle Y is double the charge on particle X. These two particles X and Y after being accelerated through the same potential difference enter a region of uniform magnetic field and describe circular paths of radii 
and 
respectively. The ratio of the mass of X to that of Y is
|
(a) |
(b) |
(c) |
(d) |
A charged particle is suspended in equilibrium in a uniform vertical electric field of intensity 20000 V/m. If mass of the particle is 9.6 
, the charge on it and excess number of electrons on the particle are respectively (g = 
|
(a) 4.8 |
(b) 5.8 |
(c) 3.8 |
(d) 2.8 |
Assertion : The permeability of a ferromagnetic material is independent of the magnetic field.
Reason : Permeability of a material is a constant quantity.
|
(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 the assertion and reason both are false. |
