Rutherford Model — Practice Quiz

Question 1

In Rutherford's experiment, the LARGE-angle scattering of α-particles is explained by:

Accepted Answer

Tiny, dense positive nucleus

Answer

Uniform charge distribution

Answer

Wave nature of electrons

Answer

Pauli exclusion

Question 2

Distance of closest approach for a 5 MeV α on gold (Z = 79) is approximately:

Accepted Answer

5 × 10⁻¹⁴ m

Answer

5 × 10⁻¹⁵ m

Answer

5 × 10⁻¹³ m

Answer

5 × 10⁻¹¹ m

Question 3

The number of α-particles scattered at angle θ varies as:

Accepted Answer

1/sin⁴(θ/2)

Answer

sin θ

Answer

cos²θ

Answer

1/cos⁴(θ/2)

Question 4

Rutherford's model fails to explain:

Accepted Answer

Stability and discrete spectra of atoms

Answer

α-scattering

Answer

Existence of nucleus

Answer

Mass of nucleus

Question 5

If KE of α is quadrupled, distance of closest approach becomes:

Accepted Answer

Quarters

Answer

Quadruples

Answer

Doubles

Answer

Halves