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The concept of thermionic emission is the basis of modern X-ray tubes, which are the workhorse of a medical X-ray image. In this process a filament (a piece of metal in a vacuum) is heated by the application of electrical current. The heat (energy) is transferred to the \'free\' electrons of the metal which allow some electrons to escape from the surface. After a short period of operation the filament has lost enough electrons to give it an overall charge of 9.50 × 10-7 C. How many electrons, ne, has the filament lost? If the filament is 1.85 g of tungsten, what fraction of electrons, ef, does this represent? (HINT: The atomic number of tungsten is 74.0, the atomic weight is 183.8 g/mol and Avogadro\'s constant = 6.02 × 1023 1/mol.)
A proton accelerates from rest through 1500 volts. the proton then enters a region of space where the magnetic field is 0.3 tesla (and this field is perpendicular to the velocity). calculate the radius of the resulting circular motion?
Assuming that all the heat generated by the resistor is absorbed by the solid substance, and that it takes 4 minutes to raise the temperature from 20to 80 degrees C, compute the specific heat for the substance.
Suppose a single electron orbits about a nucleus containing two protons (+2e), as would be the case for a helium atom from which one of the naturally occuring electrons is removed, Determine the magnitude of the electron's centripetal acceleration
assume a block of mass 25.0 kg rests on a horizontal plane, and the coefficient of static friction between the surfaces is 0.220. what is the actual static frictional force that acts on the block if an external force of 25.0 N acts horizontally on..
Estimate the acceleration of cyclist, and roller coaster.
Suppose manufactures increase in size of compact disks. By what factor will the moment of inertia increase
Pressure Variations and Ocean Exploration, How do the pressure variations with depth affect the ability to explore the ocean? How does it affect scuba diving
What is the greatest possible distance from the wall
A student suspends two identical conductive spheres (m = 0.30g) from two equally long nylon threads each 25 cm long, What is the charge on each sphere
A car races at a constant speed of 25 m/s around a circular track with a radius of 150 meters. what is the displacement between the starting and ending points
Two narrow paralle slits illuminated by tellow light with a wavelength of \lambda = 600 nm produce fringes with a separation of 0.50 mm on a screen 2m away,
Two speakers, 6.00 m apart, are driven by the same audio oscillator so that each one produces a sound consisting of two distinct frequencies, 1000 Hz and 1360 Hz. The speed of sound in the room is 350 m/s.
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