ATOMIC SPECTRA

Read the following statements:

I. It explains the origin of the emission spectrum for Hydrogen only.

II. It is impossible to know both the position and the momentum of the electron

III. It does not specify the position of the electron in the atom.

What options correspond to deficiencies of the Bohr's atomic model?

• I and II

• I and III

• II and III

• I, II and III

Read the following statements:

I. Thermal energy
II. Electromagnetic radiation
III. High voltage sources

What energy sources can be used in order to obtain the emission line spectrum of an element?

• I and II

• II and III

• I and III

• I, II and III

the diagram show

• the formation of continous spectrum

• the formation of line spectrum

The energy of second Bohr orbit of the hydrogen atom is −328kJ /mol. Hence, the energy of fourth Bohr orbit in kJ/mole would be:

• -41

• -1312

• -164

• -82

When an electron moves from n=4 to n=1, what wavelength of energy is emitted?

• 97 nm

• 410 nm

• 434 nm

• 1282 nm

The line with the shortest wavelength is produced in the hydrogen spectrum when electron moves

• from n=2 to n=1

• rom n=4 to n=1

• from n=3 to n=1

• from n=4 to n=3

State whether true or false.

Every element has its own unique atomic spectra.

• True

• False

Emission lines create ............... spectral lines on a visible light spectra due to the electrons moving into their ........... state.

The radius of the second Bohr orbit for hydrogen atom is

• 1.65 Angstrom
  

• 4.76 Angstrom

• 0.529 Angstrom

• 2.12 Angstrom

According to Bohr’s theory, the angular momentum of an electron in 5th order orbit is

• 25 h/π

• 1.0 h/π

• 10 h/π

• 2.5 h/π