Atoms Physics - Atoms

• A
  Most of the space inside an atom is empty
• B
  The electrons revolve around the nucleus under the influence of coulomb force acting on them
• C
  Most part of the mass of the atom and its positive charge are concentrated at its centre
• ✓
  The stability of atom was established by the model

Answer: D.

• ✓
  electrons
• B
  protons
• C
  neutrons
• D
  atoms

Answer: A.

• A
  A
• B
  Z
• C
  $A+Z$
• ✓
  $A-Z$

Answer: D.

• A
  $h/\pi$
• ✓
  $h/2\pi$
• C
  $2\pi/h$
• D
  $\pi/h$

Answer: B.

• A
  Humphreys series
• B
  Pfund series
• C
  Brackett series
• ✓
  Lymann's series

Answer: D.