Does the ratio of neurtons to protons in a nucleus increase, decrease or remain the same after the emission of
`beta-particl es`.

Does the ratio of neutrons to protons in a nucleus increase, decrease or remain the same after the emission of alpha-particl es .

A radioactive nucleus is represneted by the symbol _bX^a ,How is the new ucleus represented after the emission of a beta particle

The neutron to proton ratio increases during beta -decay. (True /false)

An isolated conducting sphere is given a positive charge. Does its mass increases, decreases or remains the same?

A radioactive nucleus is represneted by the symbol _bX^a ,How is the new ucleus represented after the emission of an alpha particle

A proton and an alpha -particle enter a uniform magnetic field perpendicularly with the same speed. How many times if the time period of alpha -particle than that of proton? Deduce the expression for the ratio of the radii of the circular paths of two particles.

When brakes are applied in a car,the brake-shoes apply frictional force on the wheels.these forces are internal for the system(car).For retardation,external forces ust act on the system.The force of friction at the road surface remains the same before and after teh brakes are applied (f = mu N) .How does the car stop?

Each question contains STATEMENTS-1 (Assertion) and STATEMENT -2 (Reason). Examine the statements carefully and mark the correct answer according to the instructions given below: STATEMENT-1: Nucleus does not contain fee electrons, yet it emit beta-particles STATEMENT-2: At high n/p ratio, one neutron supposed to give 1 proton and 1 e^(-)(beta) .

A proton and an alpha particle of the same velocity enter in turn a region of unifrom magnetic field acting a plane perpendicular to the magnetic field. Deduce the ratio of the radii of the circular paths described by the particles. Explain why kinetic energy of the particle after emerging from the magnetic field remains unaltered.