Pick out the correct statements from the following I. Electron emission during β-decay is always accompanied by neutrons II. Nuclear force is charge independent III. Fusion is the chief source of stellar energy
λ₁ and λ₂ are used to illuminate the slits. β₁ and β₂ are the corresponding fringe widths. The wavelength λ₁ can produce photoelectric effect when incident on a metal. But the wavelength λ₂ cannot produce […]
The concentric spheres of radii R and r have positive charges q₁ and q₂ with equal surface charge densities. What is the electric potential at their common centre?
(a) σ/ε₀(R+r) (b) σ/ε₀(R-r) […]