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Black Body Radiation: Refresher. T= temperature in kelvin l max = wavelength of maximum intensity in mm. scienceblogs.com. Black Body Radiation. Blackbody radiation depends only on temperature of object. scienceblogs.com.

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  1. Black Body Radiation: Refresher T= temperature in kelvin lmax= wavelength of maximum intensity in mm scienceblogs.com

  2. Black Body Radiation Blackbody radiation depends only on temperature of object scienceblogs.com Given this information about a light bulb, why are incandescent bulbs inefficient light sources? 2700-3300K

  3. Given this information about a light bulb, why are incandescent bulbs inefficient light sources? • A) Most of the mission spectrum is visible radiation • B) Most of the emission spectrum is UV radiation • C) Most of the emission spectrum is IR radiation. • D) Most of the emission spectrum is dark matter. • E) I don’t know 2700-3300K

  4. Blackbody Radiation Sun’s temperature: 5700 K scienceblogs.com What does this mean about the types of light the sun emit? What color is the sun?

  5. Double Slit Experiment: Young It’s a wave! http://www.olympusmicro.com

  6. Double Slit Experiment • Problem 1- Double slit experiment. Draw what the expected out come of each situation • A) Light is a particle, 1 slit. • B) Light is a particle, 2 slits. • C) Light is a wave, 1 slit. • D) Light is a wave, 2 slits.

  7. Photoelectric Effect: Einstein Visualization Exercise: It’s both! • http://phet.colorado.edu/en/simulation/photoelectric Activity Discussion:

  8. Photoelectric Effect • Problem 3- The work function for magnesium is 5.90x10-19 J. • a) What is the threshold frequency? • b) Calculate the kinetic energy and velocity of the ejected electron if the light of frequency 1.80x1015 s-1 is used for irradiating the metal.

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