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Atoms · Question 45

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

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)

AIPMT 2004

Keep practising — Atoms

2

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
AIPMT 2003
3

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
AIPMT 2001
4

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
AIPMT 2000
5

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
AIPMT 2000

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