Determination of Planck's Constant Pre-lab : Write out a definition for each term below.
Photoelectrons-
Work function of a metal-
Cutoff frequency-
Planck's constant-
Background: Characteristics of the photoelectrons are: The rate at which photoelectrons are emitted from the surface is directly proportional to the intensity of the light falling on the emitting surface. The maximum kinetic energy of the ejected photoelectrons does not depend on the intensity of the light, but is does depend on the frequency; for a monochromatic beam of light, the maximum kinetic energy of the electrons increases linearly with the frequency of the light. For a particular metal there is a definite cutoff frequency (or the threshold frequency) below which no photoelectrons are emitted There is no detectable time lag between the impinging of light on the surface of the metal and the emission of the photoelectrons.
Lab Activity – Online Simulation Open up the University of Colorado, PhET "Photoelectric effect" simulation https://phet.colorado.edu/en/simulation/photoelectric Spend a few minutes familiarizing yourself with the controls of the simulation before you begin the lab below. Finding Planck's constant:
M. Mikhaiel
William Paterson University
1. Choose the target (the cathode) from the panel at the right side. 2. Slide the source intensity to the maximum (100%). 3. Click "show only highest energy electrons" button. 4. Change the battery voltage using the button at the bottom to any number above the zero and
try to adjust the wavelength of light falling on the cathode until you see a current value of zero. Record the wavelength and the battery voltage values as shown in the table below. 5. Calculate the maximum Kinetic Energy by multiplying the charge of the electron by the Battery voltage (or the cut-off voltage). 6. Find the frequency of the light incident on the cathode by using the equation . Material
Wavelength (x10-9m)
Battery Voltage (cut-off voltage) (Volt)
KEmax(e.Vstopping) (eV)
Frequency ( )
Sodium Zinc Copper Platinum Calcium M. Mikhaiel
William Paterson University
7. Plot a graph of (KEMaximum) vs. frequency ( ) 8. Find Planck's constant from the slope of the graph, where.
But, =0 Then, h= / Which represents the slope of the graph 9. Find the % error.
Page 1 of 4. Name. Period ______ Date ______. Energy Forms & Changes Simulation. http://phet.colorado.edu/en/simulation/energy-forms-and-changes. In this simulation, you will be able to âseeâ several different forms of energy and the changes. (tr
protons than electrons. 8. Develop a relationship (in the form of a single sentence or equation) that can predict the charge based on the number and. types of particle. 9. Play with the simulation to discover what affects the mass number of your atom
Photo of Galileo Source: http://www.nmm.ac.uk/mag/pages/mnuExplore/PaintingDetail.cfm?ID=BHC2700. Sci-Port: Louisiana's Science Center How the Universe Works Page 32 of 45. Page 3 of 6. Gravity & Orbit PHET Simulation.pdf. Gravity & Orbit PHET Simula
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OF ANDROID ANTI-MALWARE SCANNERS. AV-TEST GmbH. Klewitzstr. 7 ..... Families with less than 10 samples are classified as 'Other'. The total sample set.
spectrometry still has cost affair [2]. In general, PDA detection is sensitive and has wide scanning range. The objective of present study was to estimate the residue levels of tetracycline (oxytetracycline, tetracycline and chlortetracycline) in sla
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2Magnetic Resonance Center (CERM), University of Florence, 50019 Sesto Fiorentino (FI), .... To avoid contact with air all samples were sealed in a glovebox.
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and Egle [5], Jeffrey and Humphrey [6] and Lich- tenthaler [7], produce higher Chl a/b ratios than those of Arnon [3]. Our coefficients (Table II) must, of course,.
Page 1 of 2. Name: Molecule Polarity AP Biology PhET Simulation. A study of electronegativity, bond polarity, and molecular polarity. Introduction: One of the biggest challenges of juniors taking AP biology is understanding the. concept and importanc
There was a problem loading this page. Evolution Natural selection PhET Activity.pdf. Evolution Natural selection PhET Activity.pdf. Open. Extract. Open with.
MILLENNIUM32 software (version 3.05.01) was used for data acquisition and ... the linearity, sensitivity, precision and accuracy for each ana- lyte [16].
and KCl (5 0 0), where the data in the brackets were the concen- tration ratios. ... Aunano-ME responds well for the recovery of spiked DA with high sensitivity ...
Chinese Academy of Sciences, Wuhan 430077. Abstract ... In astronomical data processing, correlation analysis of 2-dimensional and multi-dimensional time series ... data. So, a good determination of the degree of freedom for the filtered time ...
For example, the share of the administration declined from 17.3% .... programmers, technicians, supervisors, administrative, maintenance and health staff. The ...