In a particular television tube, the beam current is 60.0µA. How long does it take for 3.00 x 1020 electrons to strike the screen?
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- A stream of singly charged ions is ejected from the sun with a number density of 8.70 cm-3. The stream travels at a speed of 470.0 km/s until it strikes the circular face of a spacecraft which has a radius of 1.50 m. How much current flows onto the spacecraft?In the Bohr model of the hydrogen atom, an electron in the 8th excited state moves at a speed of 3.42 x 104 m/s in a circular path having a radius of 3.39 x 10-9 m. What is the effective current associated with this orbiting electron?Energetic particles, such as protons, can be detected with a silicon detector. When a particle strikes a thin piece of silicon, it creates a large number of free electrons by ionizing silicon atoms. The electrons flow to an electrode on the surface of the detector, and this current is then amplified and detected. In one experiment, each incident proton creates, on average, 34,000 electrons; the electron current is amplified by a factor of 100; and the experimenters record an amplified current of 3.5 μA. How many protons are striking the detector per second?
- A wire has a current density of 7.09 x 10° A/m?. If the cross-sectional area of the wire is 2.11 mm², what current I does the wire carry? A. With this current, how much time t is required for 4.05 x 100 electrons to pass any point on the wire?Question 3 In a cathode ray tube, 3.5 x 10¹5 electrons strike the screen in 30 seconds. What current does this represent? A B C D 8.57 x 10-15 A 1.68 x 10-² A 1.87 x 10-5 A 5.60 x 10-4 AWhat is correct asnwer for this?
- A stream of electrons with a linear number density of 3.10 x 1011 electrons/meter are accelerated from rest by a 62.0-V potential difference applied across two parallel plates. The electrons then pass through an aperture in the high voltage plate and into a current collector where the beam current is measured. Note: The mass of an electron is 9.11 x 10-31 kg. (a) What is the magnitude of the electric field between the plates if they are 2.07 m apart? V/m (b) What is the final velocity of each electron? m/s (c) What is the beam current? AA positive charge moves near a very long wire carrying a current as shown. If the 3.1 C charge moves at 9×105 m/s and is 11 cm away from the 7 A current in the long wire, what is the magnitude of the force on the charge? (in N)(a) 1.26(b) 3.55×101(c) 1.95×107(d) 1.12×102Consider a steady beam of protons. Each proton has kinetic energy 20 MeV. The beam represents a current of 0.25 μA. a) What is the potential difference through which the protons are accelerated? b) If the beam is directed perpendicular to a flat surface, how many protons strike the surface in 3 seconds?