Unit 8 LAB- Photoelectric Effect Created by Young Su Kang
• Google PhET Simulation- photoelectric effect
• Electron volt– a unit of energy that is equal to the energy of an electron that is accelerated by a potential difference of 1 volt
• Frequency- the number of times something happens in a given period of time
• Intensity- a measure of how much energy passes through a region in a given time
• Photoelectric effect- the emission of electrons from the surface of a material when struck by electromagnetic radiation
• Photon- the smallest possible amount of light; a quantum of light.
• Voltage- a measure of the strength of an electrical field.
• Wavelength- the distance between consecutive crests or troughs of a wave
• Work function- the minimum energy required to remove an electron from a solid …show more content…
Among Sodium, Zinc, Copper, Platinum, and Calcium, which element do you think is the hardest to extract electrons from? Explain.
2. Predict whether wavelength of a wave would play a role in the energy of the emitted electrons.
1. Observe and describe the effect of different wavelengths on speed of electrons emitted.
2. Observe and describe the effect of different levels of intensity on number of electrons emitted.
3. Select different elements of sodium, zinc, copper, platinum, and calcium. Does the type of element affect what you have answered in question 1 and 2? Explain.
4. Set the intensity to 100% and voltage to 0.00V. In the visible spectrum of light, what colors allow electrons to reach the end? (Experiment with different colors of light in the
Question # 1: Part A How many electrons and protons in an atom of vanadium? Answer # 1: Atomic number = number of protons = 23 Mass number = number of protons + neutrons Mass number = 51 g/mole Number of neutrons = 51-23 Number of Neutrons = 28 Number of electrons = atomic number = 23 Question
LABORATORY REPORT EXERCISE #5 INTRODUCTION TO THE COMPOUND LIGHT MICROSCOPE, PLANT AND ANIMAL CELLS Name_______________________________Section_____Teacher______________Date________ PRE-LAB QUESTIONS - answer the following questions using your textbook and valid internet sources. Be sure to cite your sources at the end of the prelab. You can type your answers to all questions except #1 and #9 directly into this document and then submit via Canvas. Type the answers for #1 and #9 at the end of the document. 1.
According to the Bohr model of hydrogen atom, the kinetic and potential energies of the electrons vary as .......... .. and... distance of electron from the nucleus. respectively. where r is the The square of the wavefunction, y}, gives us the Absorption of a given amount of energy gives rise to a larger increase in entropy the the initial temperature. Orbital energies in multi-electron atoms are mere difﬁcult to calculate due to the additional Select the correct answers from the following multiple choice questions.
Task 1 (P1) The periodic table is laid out into groups and periods. They are also put into different blocks S-Block, D-Block, P-block and F-Block due to their energy levels. They are organised by their energy levels and chemicals properties. As the elements go along the periods in the periodic table the electronegativity increases but as the elements go down the groups the electronegativity decreases.
The machine first receives the high energy electromagnetic wave from the Sun (in this case, its X-ray and UV) and has it colliding with a free electron. Then, the photon transfers some of its energy to the free electron. Therefore, the photo becomes less harmful and since the energy goes into increasing the electron’s kinetic energy which then generates electricity.
Because carbon dioxide is absorbed by the plant during photosynthesis less carbon dioxide present in the chamber is a sign that photosynthesis is working. The four lights used for this experiment range across the light spectrum on both sides in order to test a wider variety of wavelengths. All lights will be placed directly on the spinach leaf at the same distance so as not to give any spinach leaf a different light intensity, which could affect the data. This experiment will be able to show which light, ranging across the light spectrum, will allow the Spinach to perform photosynthesis more efficiently.
UBT1 Task 1: Electricity Introduction What is Electricity? This question is difficult to answer because this is a broad concept of science with multiple definitions. In physics, Electricity is a naturally occurring phenomenon of the flow of electric charge. In other words, the process of attraction and repulsion between electric charges produce electricity. There are two types of charges- negative charges and positive charges.
The three most important properties of a wave are the wavelength, the amplitude, and the frequency. The wavelength is the distance from one point on a wave to the next identical point on the next wave. The amplitude is the distance from a waves rest position to either the crest or trough of the wave. The frequency is a rate which represents the amount of times a wave repeats
Copper Cycle Lab Report Ameerah Alajmi Abstract: A specific amount of Copper will undergo several chemical reactions and then recovered as a solid copper. A and percent recovery will be calculated and sources of loss or gain will be determined. The percent recovery for this experiment was 20.46%.
With the use of colorimeter, it will show how much light can be transmitted through the solutions. When the cells in the solution are centrifuged, they go to the bottom of the tube to form pallets. The liquid above the pallet are clear then they are able to quickly transmit light. However if the cells has erupted, the hemoglobin is released will be left above the pallet and observed cloudy. This will cause the solution to have less light transmitted during the use of
Three Foundational Aspects The Aurora Borealis is an amazing and wonder site to spectate for all ages and especially spectacular for photographers to capture that exact moment with all the different shades, but have you ever wondered why there are different colors? Where these extravagant pictures are taken? More well as why some pictures you see are clearly more visible and vibrant than others. In these short essay I will discuss the science behind all these questions. What makes different colors?
Purpose/Introduction The process of recrystallization is an important method of purifying a solid organic substance using a hot solution as a solvent. This method will allow the separation of impurities. We will analyze Benzoic Acid as it is dissolved and recrystallized in water and in a solvent of Methanol and water. Reaction/Summary
Building Strong Relationship with Positive Energy Energy Energy is defined as the capacity for work or the force that helps us do things with vitality and intensity. This energy would be further classified into Negative or Positive; Negative Positive Negative, stressful work environments results in - Physical fatigue - Decreased optimism - Lower morale Positive, work climate makes workers feel - Uplifted - Encouraged - Empowered