Respond to the following discussion questions. Use your text book or powerpoint notes as your main reference. When using other references, be sure to cite them.

1. Discuss the relationship between the energies and frequencies of electromagnetic radiations.

2. Some electromagnetic radiations are considered to be very dangerous to us with prolonged exposure: Which ones? and why are they considered dangerous. (Comments on their energies and frequencies).

3. In reference to the third postulate of Niels Bohr, discuss how energy can be emitted or absorbed in hydrogen atom. (Include the following vocabularies: Principal quantum number, ground state and excited state of an atom). Use equations and diagrams to support your answer.