1. Lesson #19 – Espousing Electromagnetic Radiation Science standard: 9-11 PS3E EARL 4 Illustrate the electromagnetic spectrum with a labeled diagram, showing how regions of the spectrum differ regarding wavelength, frequency, and energy, and how they are used (e.g., infrared in heat lamps, microwaves for heating foods, X- rays for medical imaging). Taken from “Science K-12” (2010).

2. Plan for today Watch demo Collaborate on worksheet Reflect on learning

3. Today’s Learning Targets:  I can define a type of electromagnetic radiation based on its source, wavelength, or frequency, and locate it on electromagnetic spectrum.  I can compare types of electromagnetic radiation based on their wavelengths or frequencies and identify their uses.

4. Today’s Learning Targets:  I can define a type of electromagnetic radiation based on its source, wavelength, or frequency, and locate it on electromagnetic spectrum.  I can compare types of electromagnetic radiation based on their wavelengths or frequencies and identify their uses. Wavelength (λ, Greek lambda) = the distance between any point on a wave and the corresponding point on next crest or trough. Wavelength

5. Today’s Learning Targets: I can define a type of electromagnetic radiation based on its source, wavelength, or frequency, and locate it on electromagnetic spectrum. I can compare types of electromagnetic radiation based on their wavelengths or frequencies and identify their uses. Frequency (υ, Greek nu) = is the number of cycles the wave undergoes per second (1/second = Hz). One oscillation 

6. Today’s Learning Targets: I can define a type of electromagnetic radiation based on its source, wavelength, or frequency, and locate it on electromagnetic spectrum. I can compare types of electromagnetic radiation based on their wavelengths or frequencies and identify their uses. Electromagnetic spectrum = continuum of visible and nonvisible energy.

7. Today’s Learning Targets: I can define a type of electromagnetic radiation based on its source, wavelength, or frequency, and locate it on electromagnetic spectrum. I can compare types of electromagnetic radiation based on their wavelengths or frequencies and identify their uses. Light = electromagnetic radiation (visible and nonvisible).

8. Speed of light relates frequency and wavelength: Speed of light, C ~ 3.00x10 8 m/sec (it is constant) C = υ*λ or λ = C/υ implications for calculations, and sample problem (calculating wavelength if given frequency) Example: Calculate wavelength λ (in nm) if frequency υ =6.7x10 11 Hz

9. Example: Speed of light, C ~ 3.00x10 8 m/sec (it is constant) C = υ*λ or λ = C/υ Calculate wavelength λ (in nm) if frequency υ = 6.7x10 11 Hz. λ = C/υ = (3.00x10 8 m/sec)/(6.7x10 11 Hz) = =(3.00x10 8 m/sec)*(1/6.7x10 11 (1/sec)) = =(3.00x10 8 m/sec)*(sec/6.7x10 11 )*(10 9 nm/m) = 447761.2 nm 447761.2 nm ~ 4.5x10 5 nm

10. Electromagnetic radiation and its sources.

11. References: Taylor, D. (2012). Phyx 103-0, Waves. Retrieved November 10, 2015, from http://faculty.wcas.northwestern.edu/~infocom/Ideas/waves.html Delaney, (2015). Mrs. Delaney's Science Site. Retrieved November 10, 2015, from http://mrsdelaneyscience.blogspot.com/p/8th- grade-science-unit-2-light.html Frequency dictionary definition: Frequency defined. (2015). Retrieved November 10, 2015, from http://www.yourdictionary.com/frequency