Assertion (A) The positively charged nucleus of an atom has a radius of almost 10-15m. Reason (R) In α-particle scattering experiment, the distance of closest approach for α-particles is ≈ 10-15 m.

Question

Assertion (A) The positively charged nucleus of an atom has a radius of almost 10-15m. Reason (R) In α-particle scattering experiment, the distance of closest approach for α-particles is ≈ 10-15 m. (A) Both assertion and reason are true and reason is the correct explanation of assertion (B) Both assertion and reason are true but reason is not the correct explanation of assertion (C) Assertion is true but reason is false (D) Both assertion and reason are false

Tardigrade Admin · Accepted Answer

In α-particle scattering experiment, Rutherford found a small number of α-particles which were scattered back through an angle approaching to 180°. This is possible only if the positive charges are connected at the centre or nucleus of the atom.

Q. Assertion (A) The positively charged nucleus of an atom has a radius of almost $1 0^{- 15} m$ .
Reason (R) In $α$ -particle scattering experiment, the distance of closest approach for $α$ -particles is $\approx 1 0^{- 15} m$ .

Both assertion and reason are true and reason is the correct explanation of assertion

Both assertion and reason are true but reason is not the correct explanation of assertion

Assertion is true but reason is false

Both assertion and reason are false

In $α$ -particle scattering experiment, Rutherford found a small number of $α$ -particles which were scattered back through an angle approaching to $18 0^{\circ}$ . This is possible only if the positive charges are connected at the centre or nucleus of the atom.

Q. Assertion (A) The positively charged nucleus of an atom has a radius of almost 10−15m. Reason (R) In α-particle scattering experiment, the distance of closest approach for α-particles is ≈10−15m.