Electromagnetic spectrum
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The document discusses light and the electromagnetic spectrum. It explains that light can behave as particles or waves. The electromagnetic spectrum ranges from low energy radio waves to high energy gamma rays and visible light is a small portion of this spectrum detectable by the human eye. The document provides information on wavelength and frequency ranges across the spectrum and formulas for calculating wavelength from frequency. It also gives examples of calculating wavelength for different frequencies in the visible light spectrum.
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Electromagnetic spectrum
- 2. LIGHT PHENOMENON Isaac Newton (1642-1727) believed light consisted of particles By 1900 most scientists believed that light behaved as a wave.
- 4. THE ELECTROMAGNETIC SPECTRUM The electromagnetic spectrum represents the range of energy from low energy, low frequency radio waves with long wavelengths up to high energy, high frequency gamma waves with small wavelengths.
- 5. Visible light is a small portion of this spectrum. This is the only part of this energy range that our eyes can detect. What we see is a rainbow of colors. RedOrangeYellowGreenBlueIndigoViolet ROY G BIV
- 6. FREQUENCY RANGES Wavelengths 104 101 10-2 10-5 10-6 10-8 10-10 10-12 Frequencies (cycles per sec) 3 x 106 3 x 1010 3 x 1014 3 x 1016 3 x1018 3 x10 22
- 7. FREQUENCY RANGES OF VISIBLE LIGHT Red light has a frequency of roughly 4.3 1014 Hz, and a wavelength of about 7.0 107 m (700nm). Violet light, at the other end of the visible range, has nearly double the frequency7.5 1014 Hzand (since the speed of light is the same in either case) just over half the wavelength 4.0 107 m (400nm).
- 8. The radiation to which our eyes are most sensitive has a wavelength near the middle of this range, at about 5.5 x 10-7m (550 nm), in the yellow- green region of the spectrum.
- 9. C = The frequency (v) of a wave is the number of waves to cross a point in 1 second (units are Hertz cycles/sec ⇔ is the wavelength- the distance from crest to crest on a wave
- 10. The product of wavelength and frequency always equals the speed of light. C = 了僚 Why does this make sense? NOTE: c is a constant value= 3.00 x 108 m/s
- 11. Calculate the wavelength of yellow light emitted from a sodium lamp if the frequency is 5.10 x 1014 Hz (5.10 x 1014 s-1) List the known info List the unknown c = 3.00 x 1010 cm/s wavelength (了) = ? cm Frequency (v) = 5.10 x 1014 s-1 C = 了v 了 = c v 了 = 3.00 x 1010 cm/s = 5.88 x 10-5 cm 5.10 x 1014 s-1 PROBLEMS
- 12. YOUR TURN 1- What is the wavelength of radiation with a frequency of 1.50 x 1013 s-1? 2- What frequency is radiation with a wavelength of 5.00 x 10-6 cm? In what region of the electromagnetic spectrum is this radiation?
- 13. The colors we see in objects are the colors that are reflected, all other colors are absorbed. A red t-shirt appears red because red is reflected to our eyes and the other colors are absorbed. When all colors are being reflected we see white light (white isnt really a color)
- 14. When all wavelengths of light are being absorbed we see black (black also, isnt really a color)