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PH221-Lab 3

PH221-Lab 3 - Julia Bielaski 0163140 Lab Report#3 PH 232...

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Julia Bielaski 0163140 Lab Report #3 PH 232

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Objective : The main goal of lab number three is to find the work function of an unknown material. The system was made up of a phototube and light filters, hookup cables, voltmeter, electrometer, a variable power supply, and a mercury lamp with housing and power supply. In order to find the maximum kinetic energy (which would eventually lead to the work function) we increased the value of the voltage up to its stopping voltage. At the stopping voltage, the kinetic energy is equal to zero. We repeated the process for seven different wavelengths and recorded the results. Method : Equation 1: hv=K 0 + φ Note: if K 0 =0 then hv= φ φ : Work function Equation 2: K 0 = | e | V s Equation 1+2: | e | V s =hv + φ Equation 3: V s =(h/ | e | )v - φ/| e | Table 1.1 Wavelengths and Uncertainties Filter Number Wavelength (nm) δλ (nm) on machine 435 50 on machine 546 50 on machine 577 50 46442 360 22 46432 407 50 46052 493 80 46436 520 46 Note: Distance between light source and filters is 1 meter. Obtaining the initial frequency from the known initial wavelength: f i =c / λ I λ i =435.8nm f i =(3.0x10 8 m/s) / (435.8x10 -9 m)=6.88x10^14 Hz f i =c / λ I λ =546nm f=5.49x10^14 Hz f i =c / λ I λ =577nm f=5.20x10^14 Hz
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PH221-Lab 3 - Julia Bielaski 0163140 Lab Report#3 PH 232...

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