Q. No.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 emitted in the two cases is
1. 7/5
2. 20/7
3. 27/5
4. 27/20
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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
(m is the mass of hydrogen atom, R is Rydberg constant and h is Plank’s constant)
1.
2.
3.
4.
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The energy of a hydrogen atom in the ground state is -13.6eV. 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
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2. n = 3 to n = 1 states
3. n = 2 to n = 1 states
4. n = 4 to n= 3 states
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1. 3.4 eV
2. 6.8 eV
3. 10.2 eV
4. zero
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1. excitation of electrons in the atoms
2. collision between the atoms of the gas
3. collisions between the charged particles emitted from the cathode and the atoms of the gas
4. collision between different electrons of the atoms of the gas
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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. 3.4 eV
2. 6.8 eV
3. 13.6 eV
4. 1.7 eV
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The ionisation potential of the hydrogen atom is \(13.6~\text{eV}.\) The hydrogen atoms in the ground state are excited by monochromatic radiation of photon energy of \(12.1~\text{eV}.\) According to Bohr’s theory, the spectral lines emitted by hydrogen atoms will be:
1. two
2. three
3. four
4. one
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The total energy of an electron in an atom in an orbit is -3.4eV. Its kinetic and potential energies are, respectively:
1. 3.4 eV, 3.4 eV
2. -3.4 eV, -3.4 eV
3. -3.4 eV, -6.8 eV
4. 3.4 eV, -6.8 eV
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