Question

Assertion (A): An alpha particle is moving towards a gold nucleus. The impact parameter is maximum for the scattering angle of 180°.

Reason (R): The impact parameter in an alpha particle scattering experiment does not depend upon the atomic number of the target nucleus.

पर्याय

• If both Assertion (A) and Reason (R) are true and Reason (R) is correct explanation of Assertion (A).

• If both Assertion (A) and Reason (R) are true and Reason (R) is not the correct explanation of Assertion (A).

• If Assertion (A) is true but Reason (R) is false.

• If both Assertion (A) and Reason (R) are false.

Answer 1

If both Assertion (A) and Reason (R) are false.

Explanation:

Impact parameter, `b = (Ze^2 * cot(theta/2))/(4 pi epsilon_0 E)`

Therefore, its value is zero when the scattering angle is 180°, and it depends upon the atomic number of the target nucleus. Therefore, both the assertion and reason for it are false.