23 march

1. Rutherford used Bi as alpha particle source

2. Distance of closest approach is directly proportional to inverse of mass

3. Rutherford was able to explain line spectrum but unable to explain stability

How many correct??

• 1

• 2

• 3

• All

1. As we go to further shells, time period of electron decreases and frequency increases

2. As we go to further shells, kinetic energy of electron decreases

• True false

• False true

• False false

• True true

Two atoms collided and kinetic energy loss is 12.75 eV. The collision is

• Elastic

• In elastic

• Both have 50% possibility

• Can't say

1. Proton is made up of 3 quarks

2. Neutron is made up of 2 quarks

3. Proton is stable outside nucleus while neutron is unstable outside nucleus

How many correct

• 1

• 2

• 3

• All

1. Density of nucleus is directly proportional to mass number

2. Maximum kinetic energy of electron is directly proportional to energy of incident photon in photoelectric effect

• True false

• False true

• False false

• True true

1. Nuclear force is strongest in nature

2. It follow inverse square law

3. Its along the line joining the centre of mass

4. It is short range force

• One statement correct

• 2 statement correct

• All correct

• 3 correct