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Electromagnetic SpectrumLight as a Wave
Learning Objectives• Understand the electromagnetic spectrum• Understand the relationships between and
perform calculations involving wavelength, frequency, and the speed of light
Electromagnetic Spectrum
• Electromagnetic radiation – a form of energy that displays characteristics of a wave as it moves through space
Light as a Wave
• Waves are characterized by wavelengths and frequencies– Wavelength ( λ ) – the distance
between the same points on two successive waves
• Units of meters (m)
– Frequency ( f ) – the number of wave cycles that are completed during a unit of time• Units of hertz, Hz, or inverse seconds,
s-1 or 1/s
Light as a Wave
• Speed of light ( c ) – the speed at which electromagnetic radiation travels– Speed of light is a constant
• Units of speed of light are meters per second
Light as a Wave
Finding Frequency, Given Wavelength
Ex) What is the frequency of electromagnetic radiation whose wavelength is 5.50 × 10–7 m?
IV. Conversions needed? V. Intermediates needed?VI. Solve
VII. Does the result make sense?
I. StrategyII. Given and unknown
III. Formula
No.
No.
Yes.
Finding Wavelength, Given Frequency
Ex) What is the wavelength of electromagnetic radiation whose frequency is 6.50 × 1014 Hz?
IV. Conversions needed? V. Intermediates needed? VI. Solve
VII. Does the result make sense?
I. StrategyII. Given and unknown
III. Formula
No.No.
Yes.
Learning Objectives• Understand the electromagnetic spectrum• Understand the relationships between and
perform calculations involving wavelength, frequency, and the speed of light
Electromagnetic Spectrum