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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?
These coils have a radius R = 33 cm. The distance between the coils is, of course, also d = 33 cm (otherwise they would not form a Helmholtz system). Each coil has 72 turns. As explained above, we will not measure the current but rather the voltag..
Minh pulls a 10-kg crate on a rough inclined ramp with a cable tension F, directed towards the top and parallel to the plane. The angle of inclination of the plane is 30 and the coefficients of static and kinetic friction between the block and the in..
A shravani pulls a 5-kg block along a rough horizontal floor with a force, F, which makes an angle, theta = 30 above the horizontal, as shown. The coefficients of static and kinetic friction between the block and the floor are 0.5 and 0.3 respecti..
Transverse waves on a string have wave speed , amplitude , and wavelength . The waves travel in the -x direction, andat the end of the string has its maximum upwarddisplacement. Find the frequency of these waves.Find the wave number of these waves..
Large fossil fuel or nuclear electrical power plants operate most economically when run at full capacity 24 hours a day. Excess electrical energy can be "stored" and recovered by pumping water into a reservoir on top of a mountain and letting it fall..
For each of the following situations, evaluate whether the relationship between the given force is less than, greater than, equal to, or can't tell and explain why that would be the case. The elevator is moving downward at constant speed.
A 146 gram baseball is hit toward the left by a bat. The magnitude of the force the bat exerts on the ball as a function of time is shown in the figure below (Figure 1) .
Determine the wave's amplitude. Determine the wave's wavelength. Determine the wave's frequency. Determine the wave's speed of propagation. Determine the wave's direction of propagation.
Data on the modulus of elasticity obtained 1 minute after loading in a certain configuration and 4 weeks after loading for the same lumber specimens is presented here.
The slant shear test is widely accepted for evaluating the bond of resinous repair materials to concrete; it utilizes cylinder specimens made of two identical halves bonded at 30°.
q1. a force does 150 j of work when it acts on a moving object and its direction is in the identical direction as the
A five-slit system with 7.2 micrometers slit spacing is illuminated with 655nm light. Find the angular positions of the third and sixth minima
A 1.1 µF capacitor has an electric field of 1.2x105 V/m between two metal plates 1 mm apart. What is the energy stored on the capacitor
The blue line of the hydrogen emission spectrum has a wavelength of 433.9 nm. Calculate the energy of one photon of this light
Two workers are moving a slab of ice (m = 410 kg) across the factory floor. As seen from above, one worker exerts a force of 255 N at an angle of -50o, At what angle does the ice slab accelerate
A 10.0 g lead bullet at 23 degrees C slames into a stone wall. Assuming no loss of energy to the environment, how fast must the bullet be traveling
A 1200 kg car moving north at 27 m/s is struck by a 2165 kg car moving east at 11.0 m/s. The cars are stuck together. How fast and in what direction do they move at once after the collision.
The ac generator in a series RCL circuit has an rms voltage of 81.3 V. What is the rms current in the circuit
Two rocks collide in outer space. Before the collision, one rock had mass 15 kg and velocity ‹ 4300, ?2700, 2350 › m/s. what is the velocity of the other rock
A parallel-plate air-filled capacitor having area 50 cm2 and plate spacing 1.3 mm is charged to a potential difference of 710 V, find the energy density between the plates
A golfer hits a ball from the origin with an initial speed of 30.0m/s at an angle of 50 degrees above the horizontal. what is the speed and direction of motion of the ball just before it lands
Calculate the wavelength of light in vacuum that has a frequency of 6.0 1011 Hz and What is its wavelength in water
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