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charged metal plate oppositely charged metal plate electron small hole in the plate 1. Looking at the diagram, is the electron source on the left (heater) positive or negative? 2. Imagine that you hold a 2 kg block above the floor. As you hold the block in the air, the block's potential energy is 5 Joules. Then drop the block to the floor. Just before the block hits the floor, all of the block's potential energy has become kinetic energy. What is the speed of the block just before it hits the floor? heater sanpoid)

charged metal plate oppositely charged metal plate electron small hole in the plate 1. Looking at the diagram, is the electron source on the left (heater) positive or negative? 2. Imagine that you hold a 2 kg block above the floor. As you hold the block in the air, the block's potential energy is 5 Joules. Then drop the block to the floor. Just before the block hits the floor, all of the block's potential energy has become kinetic energy. What is the speed of the block just before it hits the floor? heater sanpoid)

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Measuring the charge to mass ratio of the electron Background We have talked about circular motion, magnetic force and electric potential in class. How it is time to put all of these together in order to determine the ratio of the charge of an electron to the mass of an electron. Prelab In cathode ray tubes, electrons are accelerated across a potential difference AV. As shown in the diagram, electrons are generated from a heater (like in a light bulb) that emits electrons when it becomes very hot (by passing an electric current through it). The electrons then fly away from the heater, (on the left in the figure) and as the electrons fly to the right, they pass through a potential difference, and they gain speed as their electric potential energy becomes kinetic energy. (KE = 1/2 mv²) As many electrons follow this same path, this creates a beam of electrons traveling at high speeds. This is sometimes called an electron gun. charged metal plate oppositely charged metal plate electron small hole in the plate 1. Looking at the diagram, is the electron source on the left (heater) positive or negative? 2. Imagine that you hold a 2 kg block above the floor. As you hold the block in the air, the block's potential energy is 5 Joules. Then drop the block to the floor. Just before the block hits the floor, all of the block's potential energy has become kinetic energy. What is the speed of the block just before it hits the floor? heater (produces electron
Transcribed Image Text:Measuring the charge to mass ratio of the electron Background We have talked about circular motion, magnetic force and electric potential in class. How it is time to put all of these together in order to determine the ratio of the charge of an electron to the mass of an electron. Prelab In cathode ray tubes, electrons are accelerated across a potential difference AV. As shown in the diagram, electrons are generated from a heater (like in a light bulb) that emits electrons when it becomes very hot (by passing an electric current through it). The electrons then fly away from the heater, (on the left in the figure) and as the electrons fly to the right, they pass through a potential difference, and they gain speed as their electric potential energy becomes kinetic energy. (KE = 1/2 mv²) As many electrons follow this same path, this creates a beam of electrons traveling at high speeds. This is sometimes called an electron gun. charged metal plate oppositely charged metal plate electron small hole in the plate 1. Looking at the diagram, is the electron source on the left (heater) positive or negative? 2. Imagine that you hold a 2 kg block above the floor. As you hold the block in the air, the block's potential energy is 5 Joules. Then drop the block to the floor. Just before the block hits the floor, all of the block's potential energy has become kinetic energy. What is the speed of the block just before it hits the floor? heater (produces electron
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