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Atoms · Question 44

AIPMT 2005MCQEasy📈 Topic in 12% papers+4−1
1

Energy levels A, B and C of a certain atom corresponding to increasing values of energy i.e. EA < EB < EC. If 1, 2 and 3 are wavelengths of radiations corresponding to transitions C to B, B to A and C to A respectively, which of the following relations is correct?

  1. 3 = 1 + 2
  2. 3 = 1 2 1 + 2
  3. 1 + 2 + 3 = 0
  4. 32 = 12 + 22

Answer

(2) 3 = 1 2 1 + 2

Solution

Energy of emitted photon: E = hc

EC - EA = (EC - EB) + (EB - EA)

hc 3 = hc 1 + hc 2

1 3 = 1 + 2 1 2

3 = 1 2 1 + 2

Answer: (2)

AIPMT 2005

Keep practising — Atoms

2

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.
AIPMT 2004
3

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
4

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
5

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
6

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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