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Atoms

AIPMT 2004MCQEasy📈 Topic in 75% papers+4−1
Ques. 1AIPMT 2004

The Bohr model of atoms

  1. Assumes that the angular momentum of electrons is quantized.
  2. Uses Einstein's photoelectric equation.
  3. Predicts continuous emission spectra for atoms.
  4. Predicts the same emission spectra for all types of atoms.

Answer

(1) Assumes that the angular momentum of electrons is quantized.

Solution

As per NCERT, Bohr's second postulate states that the electron revolves only in those orbits for which its angular momentum is an integral multiple of h2 : L = nh2 .

Angular momentum is quantised; the model predicts line (not continuous) spectra, different for different atoms, and does not use the photoelectric equation.

Answer: (1)

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Ques. 2AIPMT 2003

In which of the following systems will the radius of the first orbit (n = 1) be minimum?

  1. doubly ionized lithium
  2. singly ionized helium
  3. deuterium atom
  4. hydrogen atom
Ques. 3AIPMT 2001

The energy of hydrogen atom in nth orbit is En, then the energy in nth orbit of singly ionised helium atom will be

  1. 4En
  2. En/4
  3. 2En
  4. En/2
Ques. 4AIPMT 2000

Maximum frequency of emission is obtained for the transition

  1. n = 2 to n = 1
  2. n = 6 to n = 2
  3. n = 1 to n = 2
  4. n = 2 to n = 6
Ques. 5AIPMT 2000

When an electron makes a transition from n = 4 to n = 2, then the emitted line spectrum will be

  1. first line of Lyman series
  2. second line of Balmer series
  3. first line of Balmer series
  4. second line of Paschen series

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