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.  3.4 eV

2.  6.8 eV

3.  10.2 eV

4.  zero

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

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

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

Which statement about the Rutherford model of the atom is NOT true?

1.  There is a positively charged center in an atom called the nucleus.

2.  Nearly all the mass of an atom resides in the nucleus.

3.  The size of the nucleus is the same as that of the atom.

4.  Electrons occupy the space surrounding the nucleus.

In 1911, the physician Ernest Rutherford discovered that atoms have a tiny, dense nucleus by shooting positively charged particles at a very thin gold foil. A key physical property which led Rutherford to use gold was that it was :

1. Electrically conducting

2. Highly malleable

3. Shiny

4. Non-reactive

Particles used in Rutherford's scattering experiment to deduce the structure of atoms :

1.  Had atomic number 2 and were fully ionized

2.  Had atomic number 2 and were neutral

3.  Had atomic number 4 and were fully ionized

4.  Had atomic number 4 and were neutral

The magnitude of the acceleration of the electron in the nth orbit of the hydrogen atom is ${\mathrm{a}}_{\mathrm{H}}$ and that of singly ionized helium atom is ${\mathrm{a}}_{\mathrm{He}}$. The ratio ${\mathrm{a}}_{\mathrm{H}} : {\mathrm{a}}_{\mathrm{He}}$ is:

1.  1:8

2.  1:4

3.  1:2

4.  Dependent on n

A hypothetical atom has 3 energy levels: the ground level, 2.00 eV, and 5.00 eV above the ground level. Which frequency of the spectral lines cannot be emitted when excited?  $(h=4.136\times {10}^{-15}\mathrm{eV}\cdot \mathrm{s})$

1.  $4.84 \times {10}^{14}Hz$

2.  $7.25 \times {10}^{14}Hz$

3.  $9.67 \times {10}^{14}Hz$

4.  $12.1 \times {10}^{14}Hz$