The Photoelectric Effect Monday December 2 nd 2013

The Photoelectric Effect Monday, December 2 nd, 2013 Group #2 Colbey Hair Ruben Reyes William Brown 9/21/2021 PHYS 3313 -001, Fall 2013 1

Heinrich Hertz (1887) • Used arc-discharge apparatus • Inductive transfer of energy • 50 foot range • Enclosed receiver in dark box • Ultraviolet enhanced spark 9/21/2021 PHYS 3313 -001, Fall 2013 2

Wilhelm Hallwachs (1888) • Sought to simplify Hertz’ apparatus • Used electrometer • In dark, disk held charge • In light, charge leaked 9/21/2021 PHYS 3313 -001, Fall 2013 3

J. J. Thomson (1899) • Used gas discharge tubes • X-rays caused gas to easily conduct 9/21/2021 PHYS 3313 -001, Fall 2013 4

Philipp Lenard (1902) • Used arc lamp • Used gas discharge tube • Measured current and voltage • Stopping voltage 9/21/2021 PHYS 3313 -001, Fall 2013 5

Albert Einstein (1905) • 9/21/2021 PHYS 3313 -001, Fall 2013 6

Robert Millikan (1916) • 9/21/2021 PHYS 3313 -001, Fall 2013 7

Applications • Solar panels – Improve efficiency • Beam-interruptor detector – – Garage doors Counters Timers “Mission impossible” laser grid • Television cameras • “Electric eyes” – – – 9/21/2021 Street lamps Night light Phones PHYS 3313 -001, Fall 2013 8

Citations • • http: //en. wikipedia. org/wiki/File: Electroscope. png http: //www. hcc. mnscu. edu/chem/V. 08/page_id_32624. html http: //ancientskyscraper. com/mediac/450_0/media/ARC$20 CZECH$20 BEST$20325. gif Thornton, Stephen T. and Rex, Andrew. Modern Physics for Scientists and Engineers, fourth edition. P. 103 -104 Discussion 9/21/2021 PHYS 3313 -001, Fall 2013 9

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