Rutherfords Atomic Model

Question 1

Alpha-scattering experiment was performed by

Answer 1

Rutherford and his 2 associates:
H.Greiger
E.Marsden

Question 2

Beam used in alpha-scattering experiment

Answer 2

Beam of 5.5MeV of Bi-214 was used

Question 3

Detector used to observe scattered alpha particles

Answer 3

Rotatable detector consisting of zinc sulphide screen and microscope

Question 4

How were scattered alpha particles detected by Rutherford

Answer 4

They produced bright flash on zinc sulphide screen which can be seen through microscopes

Question 5

Number of alpha particles scattered at an angle @ by a target

Answer 5

N = [N• nt/ 4x(4||e•)^2] x [(2Ze^2)/2rK]^2 x 1/(sin^2@/2)^2

Question 6

mv^2/r=

Answer 6

mv^2/r = kZe^2/r^2

Question 7

Distance of closest approach

Answer 7

r• = 1/4||e• x 2Ze^2/K

Question 8

Impact parameter(b)

Answer 8

The perpendicular distance between alpha particle vector and nucleus when the alpha-particle is far away from nucleus

Question 9

Impact parameter=

Answer 9

b = 1/4||e• x Ze^2/K x cot(@/2)

Question 10

Relationship between number of alpha particle and foil thickness

Answer 10

N/t = constant