REVISION : BOHR'S IS MINE

Which of the following statesment is true of the Balmer series?

• The first line has the lowest frequency

• The lines in the series become closer when the frequency decrease.

• The series is in the ultraviolet region.

• The ionisation energy of hydrogen can be calculatedbfrom one of the spectral lines in the Balmer series.

What is the frequency (in Hz) of the first line in the Balmer series?

• 4.56 x 10¹⁴

• 6.16 x 10¹⁴

• 24.7 x 10¹⁴

• 29.2 x 10¹⁴

The hydrogen line spectrum is produced from energy released when

• electrons excited to a higher energy level

• excited electrons fall to a lower energy level

• electrons move around the nucleus in a fixed circular orbit

• energy of the electron is quantised

The region of electromagnetic spectrum for the Paschen

series is

• ultraviolet

• visible light

• infrared

• microwave

All of the following statements represent the postulates of Bohr’s atomic model EXCEPT

• The electron is restricted to move in a certain distance around the nucleus

• The electron of hydrogen atom moves in a circular orbit around the nucleus.

• The energy of a hydrogen electron is quantized.

• The transition of electron from higher energy level to lower energy level emits light.