9:34 564 Photo Done 12 REST E 19/ANS Measuring Planck's Constant: From Perimeter Institute for Theoretical...

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9:34 564 Photo Done 12 REST E 19/ANS Measuring Planck's Constant: From Perimeter Institute for Theoretical Physics Permis de conduire SUMMIT CRT ECK SALASKAN S SERKKON BRAM N93221 SEN HP247486 Name Lab /14 Aim: To demonstrate the quantization of light and to measure Planck's constant (h). Background: The energy lost by a single electron that passes through a light-emitting diode (LED) is converted into the energy of one photon. eAV=hf e = elementary charge = 1.6 x 10-19 C AV = potential difference across LED f = frequency of a photon emitted by LED Materials Set of 5 LED's Voltmeter 330 ww +3V batteries 3300 or 2200 resistor Procedure: 5 connecting leads CAUTION - Do not stare directly at the brightly lit LED. 1. Connect any one of the LED's to the 330 Q resistor using a wire. Connect both of these components to the batteries as shown on the diagram (with the longer wire of the LED attached to the positive terminal). 2. Connect the voltmeter across the LED. 3. Summarize your results in the table below. [2] Colour of LED Red Amber Yellow Peak Wavelength (nm) 642 617 590 Green 522 Blue UV 467 390 Potential Difference (V) Frequency (Hz) Analysis 1. Plot a graph of potential difference (y-axis) versus frequency (x-axis). [5] 2. Draw the line of best fit and calculate its slope. [2] Use this slope to calculate Planck's constant by using the equation eAV=hf [2] Question 1. Calculate your percentage error in your value for Planck's constant and comment on it. [3] + C G 9:34 564 Photo Done 12 REST E 19/ANS Measuring Planck's Constant: From Perimeter Institute for Theoretical Physics Permis de conduire SUMMIT CRT ECK SALASKAN S SERKKON BRAM N93221 SEN HP247486 Name Lab /14 Aim: To demonstrate the quantization of light and to measure Planck's constant (h). Background: The energy lost by a single electron that passes through a light-emitting diode (LED) is converted into the energy of one photon. eAV=hf e = elementary charge = 1.6 x 10-19 C AV = potential difference across LED f = frequency of a photon emitted by LED Materials Set of 5 LED's Voltmeter 330 ww +3V batteries 3300 or 2200 resistor Procedure: 5 connecting leads CAUTION - Do not stare directly at the brightly lit LED. 1. Connect any one of the LED's to the 330 Q resistor using a wire. Connect both of these components to the batteries as shown on the diagram (with the longer wire of the LED attached to the positive terminal). 2. Connect the voltmeter across the LED. 3. Summarize your results in the table below. [2] Colour of LED Red Amber Yellow Peak Wavelength (nm) 642 617 590 Green 522 Blue UV 467 390 Potential Difference (V) Frequency (Hz) Analysis 1. Plot a graph of potential difference (y-axis) versus frequency (x-axis). [5] 2. Draw the line of best fit and calculate its slope. [2] Use this slope to calculate Planck's constant by using the equation eAV=hf [2] Question 1. Calculate your percentage error in your value for Planck's constant and comment on it. [3] + C G