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Atoms · Question 27

NEET 2013 (Karnataka)MCQEasy📈 Topic in 75% papers+4−1
1

An electron in hydrogen atom makes a transition n1 n2 where n1 and n2 are principal quantum numbers of the two states. Assuming Bohr's model to be valid, the time period of the electron in the initial state is eight times that in the final state. The possible values of n1 and n2 are

  1. n1 = 6 and n2 = 2
  2. n1 = 8 and n2 = 1
  3. n1 = 8 and n2 = 2
  4. n1 = 4 and n2 = 2

Answer

(4) n1 = 4 and n2 = 2

Solution

In Bohr's model, rn n2 and vn 1n.

Tn = 2 rnvn n3

T1T2 = 8

( n1n2 )3 = 8

n1 = 2n2

Among the options only n1 = 4, n2 = 2 satisfies this.

Answer: (4)

NEET 2013 (Karnataka)

Keep practising — Atoms

2

The transition from the state n = 3 to n = 1 in a hydrogen like atom results in ultraviolet radiation. Infrared radiation will be obtained in the transition from

  1. 2 1
  2. 3 2
  3. 4 2
  4. 4 3
AIPMT 2012 (Mains)
3

Electron in hydrogen atom first jumps from third excited state to second excited state and then from second excited to the first excited state. The ratio of the wavelengths 1 : 2 emitted in the two cases is

  1. 75
  2. 2720
  3. 275
  4. 207
AIPMT 2012 (Prelims)
4

An electron of a stationary hydrogen atom passes from the fifth energy level to the ground level. The velocity that the atom acquired as a result of photon emission will be

  1. 24hR25m
  2. 25hR24m
  3. 25m24hR
  4. 24m25hR
AIPMT 2012 (Prelims)
5

An electron in the hydrogen atom jumps from excited state n to the ground state. The wavelength so emitted illuminates a photosensitive material having work function 2.75 eV. If the stopping potential of the photoelectron is 10 V, then the value of n is

  1. 2
  2. 3
  3. 4
  4. 5
AIPMT 2011 (Mains)
6

Out of the following which one is not a possible energy for a photon to be emitted by hydrogen atom according to Bohr's atomic model?

  1. 0.65 eV
  2. 1.9 eV
  3. 11.1 eV
  4. 13.6 eV
AIPMT 2011 (Mains)
7

The wavelength of the first line of Lyman series for hydrogen atom is equal to that of the second line of Balmer series for a hydrogen-like ion. The atomic number Z of hydrogen-like ion is

  1. 3
  2. 4
  3. 1
  4. 2
AIPMT 2011 (Prelims)
8

The energy of a hydrogen atom in the ground state is -13.6 eV. The energy of a He+ ion in the first excited state will be

  1. -13.6 eV
  2. -27.2 eV
  3. -54.4 eV
  4. -6.8 eV
AIPMT 2010 (Prelims)
9

The energy of a hydrogen atom in the ground state is -13.6 eV. The energy of a He+ ion in the first excited state will be

  1. -13.6 eV
  2. -27.2 eV
  3. -54.4 eV
  4. -6.8 eV
AIPMT 2010 (Prelims)
10

An alpha nucleus of energy 12mv2 bombards a heavy nuclear target of charge Ze. Then the distance of closest approach for the alpha nucleus will be proportional to

  1. 1Ze
  2. v2
  3. 1m
  4. 1v4
AIPMT 2010 (Prelims)
11

In a Rutherford scattering experiment when a projectile of charge z1 and mass M1 approaches a target nucleus of charge z2 and mass M2, the distance of closest approach is r0. The energy of the projectile is

  1. directly proportional to z1 z2
  2. inversely proportional to z1
  3. directly proportional to mass M1
  4. directly proportional to M1 M2
AIPMT 2009

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