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The electron beam Cathodes and anodes An electron gun usually consists of a cathode and an anode. The cathode is a filament that is connected to a potential difference (filament voltage), and the resulting current heats the filament to incandescence. Electrons boil off from the glowing surface of the cathode much like the filament in an ordinary light bulb. They then accelerate toward a positively charged electrode called the anode which had an opening through which some of the electrons pass. The result is a stream of the electrons whose kinetic energy is determined by the change in their electrical potential energy as they travel from the hot cathode toward the anode. If the potential difference between the cathode and anode is V (anode voltage), then the increase in the kinetic energy of the electrons is given by: ?K = e Vwhere e is the charge of the electron. Electrons leave the cathode with very little initial kinetic energy, so we can safely approximate ?K ~ K, where K is the kinetic energy of the electrons that reach the anode. Therefore, the kinetic energy of the electrons that go through the slit (at the anode) is: K = e VUse the expression above to write an equation for the speed of the electrons as a function of the anode voltage. This will be equation 1. Write this expression in the appropriate space at the beginning of activity 4 in the manual. What is the main source of kinetic energy of the electrons?
A Carnot engine operating between a warmer unknown temperature and a reservoir of boiling helium at 1.76 K has an efficiency of 59% What is the warmer temperature
A student is reading a lecture written on a blackboard. The lenses in her eyes have a refractive power of 58.05 diopters, How far is the blackboard from her eyes
The wall of a house consists of three layers: a wooden outer wall with an R factor of 1.0, a 3in layer of fiberglass insulation with an R factor of 11, what is the rate of heat loss throug an 8ft by 15ft section of this wall
q1. how many revolutions per minute would a 29 rm m-diameter ferris wheel require to make for the passengers to feel
Find the area under the graph of the polar curve r=(e^theta) for 0
A speeder is pulling directly away and increasing his distance from a police car that is moving at 27 m/s with respect to the ground. Find the speeder's speed with respect to the ground
A 1x10^2-kg crate is being pushed across a horizontal floor by a force that makes an angle of 30.0° below the horizontal. The coefficient of kinetic friction is 0.25. What must be the magnitude of, so that the net work completed by it and the kine..
A circular wheel has a radius R = 0.45 + or - 0.02 m. The wheel is observed to be rotating uniformly with period T = 2.00 +or- 0.05 s. Compute the frequency with which the wheel spins
A uniform, spherical cloud of interstellar gas has mass 2.0x10^30 kg, and radius 1.0x10^13 m and is initially rotating with a period of 1.4x10^6 yrs. what will be the star's rotational period
What is the total distance traveled by a car if for 130 m with a deceleration of 1.20 m/s^2 and 50 m with a deceleration of 7.10m/s^2?
Sam, whose mass is 71.0kg , takes off down a 45.0m high, 8.00? slope on his jet-powered skis. What is the coefficient of kinetic friction of his skis on snow
At the instant the traffic light turns green, an automobile starts with a constant acceleration a of 1.8 m/s2. How fast will the automobile be traveling at that instant
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