Alpha-particle scattering, Rutherford's model
- Given below are two statements :Statement I : Atoms are electrically neutral as they contain equal number of positive and negative charges.Statement II : Atoms of each element are stable and emit their characteristic spectrum.In the light of the abov… Answer: 4. Statement I is correct but Statement II is incorrect. Key idea: Check each statement on its own. Statement I: An atom has equal n... 1
- When an α-particle of mass 'm' moving with velocity 'v' bombards on a heavy nucleus of charge 'Ze', its distance of closest approach from the nucleus depends on m as : Answer: 1. 1/m Key idea: at the closest approach all kinetic energy becomes electrostatic potential energy. 1/2mv²=k(2e)(Ze)/r₀⇒ r₀=4kZe²/mv... 1