10пт х 10пт х 10пт and it is dopant density is 2 x 1018 cm-3. It is known that the silicon atom ст density is 5 x 1022 cm-3. What is ст the number of dopant atoms in the channel?
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- When two point charges are 2.0 m apart, ea h one experiences a 1.0-N electric force due to the othercharge. If they are moved to a new separation of 8.0 m, calculate the electric force on each of them.B5In a television picture tube, electrons strike the screen after being accelerated from rest through a potential difference of 17000 V. The speeds of the electrons are quite large, and for accurate calculations of the speeds, the effects of special relativity must be taken into account. Ignoring such effects, find the electron speed just before the electron strikes the screen.
- (II) A 1.5-MeV (kinetic energy) proton enters a 0.30-Tfield, in a plane perpendicular to the field. What is theradius of its path?A proton, an alpha particle (a bare helium nucleus), and a singly ionized helium atom areaccelerated through a 100-V potential difference. (a) How much energy is gained by each? (b) Assumeeach started from rest. What is the final velocity of each?(I) What potential difference is needed to stop an electronthat has an initial velocity v= 6.6 x 105 m/s ?
- If the magnitude of the force between two charges is 1N when they are 1.0 meters apart, what will be the force on each charge when the magnitude is tripled?If an electron travels 0.350 m from an electron gun to a TV screen in 24.0 ns, what voltage (in V) was used to accelerate it? (Note that the voltage you obtain here is lower than actually used in TVs to avoid the necessity of relativistic corrections.)Consider an infinite long wire with a linear mass density p. If r denotes the distance from the wire, (a) find the gravitation field as a function of r. (b) find the gravitation potential as a function of r (you could leave a constant free parameter in the result). (c) For a particle of mass m released from rest at r=ro, what is the speed of the particle when reaching r=ro/2.
- Draw a diagram and calculate how the charges are apartMillikan measured the electron's charge by observing tiny charged oil drops in an electric field. Each drop had a charge imbalance of only a few electrons. The strength of the electric field was adjusted so that the electric and gravitational forces on a drop would balance and the drop would be suspended in air. In this way the charge on the drop could be calculated. The charge was always found to be a small multiple of 1.6e-19 C. Find the charge on an oil drop weighing 3.34 10-14 N and suspended in a downward field of magnitude 2.98 104 N/C.Write down the sign, and magnitude of the charge of the electron.