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Atoms · Question 39

AIPMT 2008MCQEasy📈 Topic in 38% papers+4−1
1

In the phenomenon of electric discharge through gases at low pressure, the coloured glow in the tube appears as a result of

  1. collisions between the charged particles emitted from the cathode and the atoms of the gas
  2. collision between different electrons of the atoms of the gas
  3. excitation of electrons in the atoms
  4. collision between the atoms of the gas

Answer

(1) collisions between the charged particles emitted from the cathode and the atoms of the gas

Solution

At low pressure, electrons (and ions) emitted from the cathode are accelerated by the high potential difference across the tube.

These fast charged particles collide with the atoms of the gas and transfer energy to them.

The atoms are excited to higher energy levels; on returning to lower levels they emit light of wavelengths characteristic of the gas.

The coloured glow is a result of collisions between the charged particles emitted from the cathode and the atoms of the gas (excitation alone is only the intermediate step caused by these collisions).

Answer: (1)

AIPMT 2008

Keep practising — Atoms

2

The ground state energy of hydrogen atom is -13.6 eV. When its electron is in the first excited state, its excitation energy is

  1. 10.2 eV
  2. 0
  3. 3.4 eV
  4. 6.8 eV
AIPMT 2008
3

The total energy of electron in the ground state of hydrogen atom is -13.6 eV. The kinetic energy of an electron in the first excited state is

  1. 6.8 eV
  2. 13.6 eV
  3. 1.7 eV
  4. 3.4 eV
AIPMT 2007
4

Ionization potential of hydrogen atom is 13.6 eV. Hydrogen atoms in the ground state are excited by monochromatic radiation of photon energy 12.1 eV. According to Bohr's theory, the spectral lines emitted by hydrogen will be

  1. one
  2. two
  3. three
  4. four
AIPMT 2006
5

The total energy of an electron in the first excited state of hydrogen atom is about -3.4 eV. Its kinetic energy in this state is

  1. 3.4 eV
  2. 6.8 eV
  3. -3.4 eV
  4. -6.8 eV
AIPMT 2005
6

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
AIPMT 2005
7

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
8

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
9

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
10

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
11

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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