You sometimes create a spark when you touch a doorknob after shuffling your feet on a carpet. Why? The air always has a few free electrons that have been kicked out of atoms by cosmic rays. If an electric field is present, a free electron is accelerated until it collides with an air molecule. It will transfer its kinetic energy to the molecule, then accelerate, then collide, then accelerate, collide, and so on. If the electron’s kinetic energy just before a collision is 2.0×10−18 J or more, it has sufficient energy to kick an electron out of the molecule it hits. Where there was one free electron, now there are two! Each of these can then accelerate, hit a molecule, and kick out another electron. Then there will be four free electrons. In other words, as shows below, a sufficiently strong electric field causes a “chain reaction” of electron production. This is called a breakdown of the air. The current of moving electrons is what gives you the shock, and a spark is generated when the electrons recombine with the positive ions and give off excess energy as a burst of light.
(These answers are correct, I just cannot figure out part D)
part a) a = 1.1×1018 m/s2 ; part b) F = 1.0×10−12 N ; part c) E = 6.3x106 N/C part d) ???
You sometimes create a spark when you
You sometimes create a spark when you touch a doorknob after shuffling your feet on a...
You sometimes create a spark when you touch a doorknob after shuffling your feet on a carpet. Why? The air always has a few free electrons that have been kicked out of atoms by cosmic rays. If an electric field is present, a free electron is accelerated until it collides with an air molecule. It will transfer its kinetic energy to the molecule, then accelerate, then collide, then accelerate, collide, and so on. If the electron You sometimes create a...
3. Dielectric breakdown of a gas (a) An electron starts from rest and moves a distance under the influence of a unifornm electric field of magnitude E. Assume that the displacement is in the direction of the electric field. What is the final kinetic energy of the electron? Give your answer in terms of q - charge of the electron, m-mass of the electron. E and (b) Suppose the final kinetic energy of the electron is 10 eV and 1...
Atoms can bond to other atoms to make molecules. Atoms sometimes break these bonds and form them in a different way. For example, it is possible to take two molecules of hydrogen (H_2) and one molecule of oxygen (O_2), put them near one another, give them a little spark to help them start a reaction, and you will end up with two molecules of water (H_2O). Do you see what happened? Some of the H-H bonds and the O-O bonds...
i need a, b, and c Note: a lowercase letter indicates a q The PlLb address in your Lab Narrative questions is to prompt / reminough answetion ok. The pul to write in your to a few questions is Thoughtful and thorough answers ferred over quick answers o every question rticle in a Magnetie Field Demo Description of e/m apparatus: air ch of helium gas is inserted. We it glows in The heart of this instrument is a evacuated and...
Part II After working through the macromolecules in your friend’s extremely pale burrito, you look at her and think you might have an idea about what is going on. You ask Maria, “Do you usually eat like this?” “Yup,” she says, “I love all the carbs, rice, and bread, as well as cheese. Sometimes I eat a piece of fruit or some carrot sticks. And energy drinks!” You then point out to your friend that she seems to be getting...
e. 18 Test Your Knowledge MULTIPLE CHOICE: Choose the one best answer. 1. Each element has its own characteristic atom in which a. the atomic mass is constant. b. the atomic number is constant. c. the mass number is constant. d. Two of the above are correct. e. All of the above are correct. 2. Which of the following is not a trace element in the human body? a. iodine b. zinc c. iron d. calcium e. fluorine 3. A...
need ans for the following questions, the last 3 pages for more info. Questions: more info: expermint e/m avr=1.71033*10^11 7 2 points of the following options, which conditions for V or I produce the largest radius of the electron beam path r? Hint: Use e/m= 2V (5/4)*aP/(Nuo Ir) Maximum land Maximum V O Maximum land Minimum V Minimum I and Maximum V Minimum I and Minimum V 8 2 points By what factor will change if the radius of the...