lab 7 plancks constant

lab 7 plancks constant - PHY 1033 Fall 2010 Lab #7 G. Ihas...

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PHY 1033 Fall 2010 Lab #7 G. Ihas Oct. 26 Planck’s Constant from the PhotoElectric Effect Goal: To determine Planck's constant by measuring stopping voltage as a function of incident light wavelength for a metallic photocathode (electron emitter). Prelab Questions (to be turned in before lab begins): Review Appendix A in your textbook about energy. 1. How many Joules in 1 eV (electron volt)? (The charge on the electron e = 1.6x10-19 Coulombs ; 1 eV is the energy of an electron accelerated through 1 V; and 1 Coulomb x Volt = 1 Joule.). In this lab you will need to convert eV into Joules. 2 . What is the frequency of the red light from a helium-neon laser (see below)? In this lab you will need to convert wavelength into frequency. 3 . Look at the Light Spectrum Demonstration in the NPB Lobby. Study it, particularly noticing the 3 spectral lines emitted by the Mercury (Hg) light (the lowest source). These are the 3 wavelengths you will use in your experiment. Equipment EP-05 Photoelectric Effect Apparatus (Daedalon Corp.) Mercury Arc Lamp Helium-Neon Laser Set of red, blue and cyan filters Adjustable stands (or stack of papers or thin containers) for adjusting heights of lamp and EP-05 Digital Multimeter He-Ne laser Method (adapted from Daedalon Corp. Instruction Manual for EP-05)
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lab 7 plancks constant - PHY 1033 Fall 2010 Lab #7 G. Ihas...

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