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0=hf-8AV Write an expression for the work function in terms of h, f. g. AV Target: Sodium Set the wavelength to 250 nm (closest to) Move the switch of the battery to the point where electrons no longer reach the opposite plate (stopping voltage). Find the frequency of the light Find the work function in Joules and electron Volts. Do the same for other materials (you may need to adjust the wavelength of light) a. b. C. e. f. Wavelength Stopping voltage AV (V) Frequency Work Function Work Function 2 (nm] f [Hz) O [eV] -3.20 Sodium 250 0. 0128 Zinc 250 -1.00 0.0040 Copper 250 -0.30 0.0012 190 Platinum -0.25 0.0013 250 Calcium -2.10 O,0084 250 ????? -1.30 0,0052 3. Stopping Voltage (): hf AV = Write an expression for the stopping voltage in terms of h, f, q, What would be the stopping potential if ultraviolet light of wavelength 250 nm were incident on the surface? f h-f/q [V) /9 (V] Stopping voltage AV (V] [Hz] 1.2 x10:5 Sodium 1.2x1015 Zinc 1.2x 1015 Copper 1.2x10'5 Platinum 1.2x101s Calcium 1.2 xi 01s 22222

0=hf-8AV Write an expression for the work function in terms of h, f. g. AV Target: Sodium Set the wavelength to 250 nm (closest to) Move the switch of the battery to the point where electrons no longer reach the opposite plate (stopping voltage). Find the frequency of the light Find the work function in Joules and electron Volts. Do the same for other materials (you may need to adjust the wavelength of light) a. b. C. e. f. Wavelength Stopping voltage AV (V) Frequency Work Function Work Function 2 (nm] f [Hz) O [eV] -3.20 Sodium 250 0. 0128 Zinc 250 -1.00 0.0040 Copper 250 -0.30 0.0012 190 Platinum -0.25 0.0013 250 Calcium -2.10 O,0084 250 ????? -1.30 0,0052 3. Stopping Voltage (): hf AV = Write an expression for the stopping voltage in terms of h, f, q, What would be the stopping potential if ultraviolet light of wavelength 250 nm were incident on the surface? f h-f/q [V) /9 (V] Stopping voltage AV (V] [Hz] 1.2 x10:5 Sodium 1.2x1015 Zinc 1.2x 1015 Copper 1.2x10'5 Platinum 1.2x101s Calcium 1.2 xi 01s 22222

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Lab 12 - Photoelectric Effect Google: PHET PHOTOELECTRIC EFFECT, run the simulation H 1. Start with sodium for target material. Keep the voltage of the battery at 0. Change light intensity and/or light wavelength; Draw your observations (use arrows to represent the relative velocity of electrons) Record the magnitude of the electric current a. b. Intensity: 100% Intensity: 100% Wavelength: 100 nm Nv ce att Wavelength: 300 nm Electric current: 0.882 Electric current: 0. 5y9 Intensity Infensity 100 m 100 ID0 nm fast slow Current 082 Current 08m2 0.00 V a 00v Intensity: 100% Intensity: 100% Wavelength: 500 nm Wavelength: 700 nm Electric current: Electric current: Intensity 100% Intensity 100 nm 100% 100 nm slow Current: Oz 0.00 V Current o. 0.00 V What is observed when intensity increases? e- more faster What is observed when wavelength increases? e- move slower, less e- What is observed when frequency increases? e move faster
Transcribed Image Text:Lab 12 - Photoelectric Effect Google: PHET PHOTOELECTRIC EFFECT, run the simulation H 1. Start with sodium for target material. Keep the voltage of the battery at 0. Change light intensity and/or light wavelength; Draw your observations (use arrows to represent the relative velocity of electrons) Record the magnitude of the electric current a. b. Intensity: 100% Intensity: 100% Wavelength: 100 nm Nv ce att Wavelength: 300 nm Electric current: 0.882 Electric current: 0. 5y9 Intensity Infensity 100 m 100 ID0 nm fast slow Current 082 Current 08m2 0.00 V a 00v Intensity: 100% Intensity: 100% Wavelength: 500 nm Wavelength: 700 nm Electric current: Electric current: Intensity 100% Intensity 100 nm 100% 100 nm slow Current: Oz 0.00 V Current o. 0.00 V What is observed when intensity increases? e- more faster What is observed when wavelength increases? e- move slower, less e- What is observed when frequency increases? e move faster
O = hf-BAV Write an expression for the work function in terms of h, f, q, AV Target: Sodium Set the wavelength to 250 nm (closest to) Move the switch of the battery to the point where electrons no longer reach the opposite plate (stopping voltage). a. b. C. d. Find the frequency of the light e. Find the work function in Joules and electron Volts. f. Do the same for other materials (you may need to adjust the wavelength of light) Wavelength Stopping voltage AV [V] Frequency Work Function Work Function 2 (nm] f [Hz] O [] $ [eV] -3.20 Sodium 250 0. 0128 250 Zinc -1.00 0.0040 250 Copper -0.30 0.0012 190 Platinum -0.25 0.0013 250 Calcium -2.10 O.0084 250 ????? -1.30 0.0052 3. Stopping Voltage (): hf AV 2. Write an expression for the stopping voltage in terms of h, f, q, o What would be the stopping potential if ultraviolet light of wavelength 250 nm were incident on the surface? h-f/q /q (V] Stopping voltage [Hz] [V] AV (V] 1.2 x10!5 Sodium 1.2x1015 Zinc 1.2x1015 Copper 1.2 x 10'5 Platinum 1.2 x 1015 Calcium 1.2 x1015 22222
Transcribed Image Text:O = hf-BAV Write an expression for the work function in terms of h, f, q, AV Target: Sodium Set the wavelength to 250 nm (closest to) Move the switch of the battery to the point where electrons no longer reach the opposite plate (stopping voltage). a. b. C. d. Find the frequency of the light e. Find the work function in Joules and electron Volts. f. Do the same for other materials (you may need to adjust the wavelength of light) Wavelength Stopping voltage AV [V] Frequency Work Function Work Function 2 (nm] f [Hz] O [] $ [eV] -3.20 Sodium 250 0. 0128 250 Zinc -1.00 0.0040 250 Copper -0.30 0.0012 190 Platinum -0.25 0.0013 250 Calcium -2.10 O.0084 250 ????? -1.30 0.0052 3. Stopping Voltage (): hf AV 2. Write an expression for the stopping voltage in terms of h, f, q, o What would be the stopping potential if ultraviolet light of wavelength 250 nm were incident on the surface? h-f/q /q (V] Stopping voltage [Hz] [V] AV (V] 1.2 x10!5 Sodium 1.2x1015 Zinc 1.2x1015 Copper 1.2 x 10'5 Platinum 1.2 x 1015 Calcium 1.2 x1015 22222
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