Name _______________________________________ Pd ____ Date ___________________ Electromagnetic Radiation Review 1. What is electromagnetic radiation? 2. Name the regions of the electromagnetic spectrum and give their approximate wavelength (in meters), frequency (in Hz) and energy (in Joules). Show your work for any calculations you do. 3. List 4 ways EM radiation impacts your life. 4. Einstein theorized that EM radiation has a dual wave-­‐particle nature. What are the key characteristics of this theory? 5. What happens when an electron absorbs a photon of EM radiation? 6. What happens when an electron moves from its excited state to its ground state? Use the diagram below for questions 7 through 9. The diagram to the right shows some of the emission lines from the hydrogen emission spectrum. These spectral lines are grouped in series, which are named after the scientist that discovered them. For example, the Lyman series is named after Theodore Lyman who discovered these emission lines. Lyman series Balmer series Paschen series 7. Lyman Series -­‐ Identify the energy transition (n=? to n=?) of the most energetic and least energetic photons emitted; and calculate their frequency (in Hertz) and energy (in Joules). Show your work. a. most energetic b. least energetic c. What do all 5 electron transitions in this series have in common? d. What region(s) of the electromagnetic spectrum do these photons belong to? 8. Balmer Series -­‐ Identify the energy transition (n=? to n=?) of the most energetic and least energetic photons emitted; and calculate their frequency (in Hertz) and energy (in Joules). Show your work. e. most energetic f.
least energetic g. What do all 4 electron transitions in this series have in common? h. What region(s) of the electromagnetic spectrum do these photons belong to? 9. Paschen Series -­‐ Identify the energy transition (n=? to n=?) of the most energetic and least energetic photons emitted; and calculate their frequency (in Hertz) and energy (in Joules). Show your work. i. most energetic j.
least energetic k. What do all 3 electron transitions in this series have in common? l.
What region(s) of the electromagnetic spectrum do these photons belong to? 10. Why is an element’s atomic emission spectrum unique?