WAEC Physics Past Questions & Answers - Page 241

I. All elements emit and absorb characteristic spectra.
II. Spectral analysis is an important method of identifying environmental pollutants.
III. The chemical composition of stars could be determined using spectral analysis.

Which of the statements above are correct?

The diagram above illustrates the energy transitions of five electrons of an atom. Which of the transitions will produce the emission of highest frequency?

The diagram above illustrates the energy transitions of five electrons of an atom. Which of the transitions will produce the emission of longest wavelength?

Bohr’s atomic model proves most successful for the explanation of the.

I. structure of the hydrogen atom;
II. line spectra of the hydrogen atom;
III. Multi-electron atoms.

Which of the statements above is/are correct?

A point charge of magnitude 2μC is moved through a distance of 0.02 m against uniform field of intensity 25 Vm^-1 Calculate the work done on the charge