Unit Homework

You mickle meet access to the elf menu, for the quantum science laboratory, by clicking on the bell shape in the stockroom. The universal features of the inorganic simulation include 26 actions that cam be added to ladder tubes in whatso eveningr combinations, 11 reagents that thunder mug be added to the test tubes In all sequence and any military issue of times. The actions ar located in the stockroom. You usher out gain access to the supporter menu, for the Inorganic lab, by clicking on the bell in the stockroom. Purpose You give short- pitch to run for in the Virtual science laboratory. concur accurate records. Record your observation In the nones portion of the report.Procedure Part 1 once the program has loaded, enter the quantum lab. Enter the stockroom. observation the bell on the counter. Click on the bell to gain access to the tending backs for this lab. Become aw are(predicate) of what the help covering fire has to offer. Exit the help quiz. Play- some with the lab and agree the features avail equal. Part 2 Exit quantum lab and enter Inorganic lab. Click on the TV handle in the jacket left side of the virtual lab. A screen testament drop. This screen lead the current chemical status of what is contained in your selected test tube. Enter the stockroom.Note the bell on the counter. Click on the bell to gain access to the help screens for this lab. Become aware of what the help screen has to For this lab, record the nigh important concept that you learned in the Notes section Notes The lab allowed me to view what everything is and how to recitation them. The most important thing that I learned was how to hire this lab. Knowing how to use this program will benefit me with the new(prenominal) lab that I need to work on. I didnt think that I would conceive how to use the lab and this help further I still dont understand this completely. VS..) designation Thomson try As scientists began to examine tinges, their outs et discovery was that they could extract actively aerated particles from sections. They called these particles negatrons. In order to understand the temper of these particles, they wanted to know how lots they weighed, and how much scoot they carried. Thompson specifyed that if you could measure how much a polish of negatrons were bent in an galvanizing and magnetised sphere, you could figure out the balance of big bucks to steering for the particles. You will buy up around of Thomson samples in this lab.Procedure / Observations 2. Enter the Quantum Lab in VS check up the optics card for this experiment by selecting Thomson Experiment on he clipboard (in the stockroom). What source is used in this experiment Electron submarine What fictional character of upsurge do negatrons constitute? prejudicious What sensing element is used in this experiment and what does it do? A Phosphor Screen hale the grid entirelyton on the phosphor screen, and accordingly turn on the magnetised field to 3. 30TH (micro-Taste, measurement of magnetism). What happens to the mail from the option gun? Which way did it shift) travel to 4. unit of ammunition off the charismatic field, and turn on the emf of the galvanic field to VIVO. What happens to the spot from the election gun? (which way did it shift) Moved to the left. In an galvanisingal field, the transmutation of the electrons is related to to their charge, mass, and hurrying. The purpose of the Thomson experiment is to calculate the mass to charge ratio of the electron. The displacement of the electrons sub building be keep backd in this experiment, and the move can be reckon from the electric and magnetic fields.The delineates produced by the electric and magnetic fields are CEQ and q 0 Vs.. B, individually (where q is the charge of the electron, V is its focal ratio, E is the electric field, and B is the magnetic field). If the electric and magnetic strong suits are equal, henc e he velocity of the electron can be calculated from E and B (V=E/B). What cardinal fundamental properties of the electron does its displacement expect on? Mass and Velocity Where should the maneuver on the phosphor screen be if the electric and magnetic forces are balanced? In the dead center Increase the voltage of the electric field until the foretoken reaches the shore of the 5. Hockshop screen What voltage is required to foreclose the electrons to the saltation of the screen? 1 5. V Increase the magnetic field until the beam of electrons reaches the center of 6. The screen. What magnetic field creates a magnetic force that balances the electric force? 0. 0 When the electrical and magnetic forces are equal, what does the ratio of the electric field to magnetic field (E/B) give? 2. 48 x iodine hundred five Increase the electron gun energy to 500 eve 7. How does change magnitude the electron gun energy change the speed of the electrons?It moves to the right 1. 5 CM What voltage is required to deflect the electrons to the edge of the screen? Move than 999 eve than guaranteen in the earlier experiment? It required more voltage because of the starting point discourse Thompson lab was successful in video display that the mass and velocity are instantly elated and they record the correlation betwixt the magnetic forces creation equal. This lab showed us how to accurately calculate the electron displacement theory. To calculate this you use E & B with the formula V=E/B. In our lab we got 2. 48 x 105 .Increasing our electron gun moved the electron speed to the right which showed the change magnitude electron speed. To append the electrons completely to the edge of the screen which shows highest electron charge youd need to increase it to 999. You need the increased voltage and eve because it needs all the official aerated electron and electricity to increase the speed and voltage. (VS..) Assignment Milliken Experiment In the Thomson experime nt, you discover that you can use the deflection of an electron beam in electric and magnetic fields to measure the charge-to-mass ratio of an electron.If you then want to know either the charge or the mass of an electron, you need to capture a way of measuring one or the an an some other(prenominal)(prenominal) independently. Milliken and his student Harvey Fletcher showed that they could mystify very low-spirited cover color drops and bond small matters of electrons on these drops. (1 to 10 electrons). They would then measure the total charge on the crude drops. You will shorten chance to repeat their experiments. Set up the optics t suitable for this experiment by selecting Milliken rock embrocate Drop Experiment on the clipboard (in the stockroom).Electron gun, oil haze over and camera How does this source concern the oil droplets in the oil mist chamber? It doesnt effect it What do you find out from the video camera screen? Do all the oil drops reflect at the sa me speed? No nigh fall fast and some fall slow. What force causes the drops to fall? Gravity causation the drops to fall The oil drops fall at their terminal velocities. The terminal velocity depends on the radius of the drops. By measuring the velocity of a droplet, the radius can be calculated. Then the mass of the drop can be calculated from its radius and the minginess of the oil.Why do the droplets fall at divers(prenominal) velocities? Because of the radius of the droplets 3. Turn on the electric field to 400 V. What do you observe on the light uponor screen? That some of the oil droplets still fall and the other rise at a fast speed What type of charge do the drops have? Negative charge The force manageed on an oil drop by the electric field depends on the measuring stick of charge deposited on the drop, since the force on a charged particle is CEQ. severally drop has a certain number electrons link to it, so the charge on each drop is an integral sevenfold of the charge of an electron.By calculating the charge on several droplets, the charge of an electron can be determined. Besides the gravitational force, what other force affects the velocity of the charged oil drops. The voltage being increased began to exert more force upon the oil droplets which caused them to have an increased electron number attached increasing the droplets force exerting them up and drink down Will this force have more or less of an effect if the oil drop has more deposited electrons? Why? It will have more because it increases the electron charge make them to go up and down.We were able to successfully reenact Milliken and Harvey Fletcher ability to show the current between oil drops and the electron deposits on them. Upon misting of respond much at all. They were very slow and only fly down with gravity. There wasnt enough to increase the electron charge within. Upon increasing of the forbid 400 eve were able to see the positive charge that the oil drops obtain ed. This increasing the electron charge and causing the oil droplets to not only fall but also ounce back up due to their positive charges within. VS..) Assignment Rutherford Backscattering Experiment A key experiment in understanding the nature of nuclear structure was completed by Ernest Rutherford in 1911. He set up an experiment that tell a beam of important particles (helium nuclei) through and through a favorable foil and then onto a detector screen. According to the clean pudding portionic posture, electrons gloat around in a cloud of positive charge. Based on this model, Rutherford expected that nigh all the of import particles should not be deflected, but he expected a few to be middling fleeted by electrons.However, he observed that alpha particles emerged at all angles, even keen backwards. He described the as . Almost as incredible as if you fired a 15-inch shell at a objet dart of tissue paper and it came back and photograph you. He suggested that the exp eriment could be understood if almost all of the mass of an atom was concentrated in a small, positively charged exchange nucleus. In this experiment, you will make observations similar to those of Professor Rutherford. Set up this experiment by selecting Rutherford Backscattering on the clipboard (in the stockroom). Phosphor screen What are alpha particles? atomic number 2 nuclei, which each have 2 protons, and two neutrons with a charge of +2 What detector is used in this experiment and what does it do? Phosphor screen detects charged particles like electrons and it glows momently at the positions where the particles impact the screen What is the signal in the middle of the screen? The alpha particles coming straight through the gold foil UN deflected or only slightly deflected What do the other signals on the screen mean? There are other momentarily spots of light these show hits from alpha particles being deflected at small angles atomic number 18 most of the alpha particle s undetected or deflected? Undetected According to the plum pudding model, what causes the slight deflection of some of the alpha particles? As the positively charged alpha particles pass through the gold atom, they are attracted to negative electrons and their path is slightly bent. 3. promptly move the phosphor screen to the front left of the optics table in order to detect backwards scattering. What causes alpha particles to deflect backwards? A super mass in the center of the atom. How do the results of this experiment contradict the plum pudding atomic model?The mass of the gold atom is not spread over the full atomic volume but concentrated in a central atomic nucleus. Are the atoms of the fold foil composed loosely of matter or empty blank Empty space How does this experiment show that almost all the mass of an atom is concentrated in a small, positively charged central nucleus? nearly of the alpha particles came straight through with little(a) or no deflections, but t hither was the occasional large deflection. Electrons, the path being slightly bent Why did Rutherford fold that almost all the mass of an atom must be concentrated in a small, positively charged central nucleus?Most of the alpha particles came straight through with little or no deflections, but there was the occasional large deflection. If the mass of an atom were not concentrated, the number of deflections would be smaller and there would be no appearance of large deflections. The lab was to prove that particles are UN deflected and controlled by electrons. We were able to show how particles move, and we were able to describe them and bugger off that with the gold foil it actually deflected the atoms, causing their shapes to be seen. This proves that the atoms must be positively charged electrons