A cathode ray tube (CRT) is a device that produces a focused beam of electrons in a vacuum. The electrons strike a phosphor-coated glass screen at the end of the tube, which produces a bright spot of light. The position of the bright spot of light on the screen can be adjusted by deflecting the electrons with electrical fields, magnetic fields, or both. Although the CRT tube was once commonly found in televisions, computer displays, and oscilloscopes, newer appliances use a liquid crystal display (LCD) or plasma screen. You still may come across a CRT in your study of science. Consider a CRT with an electron beam average current of 31.00 μA. How many electrons strike the screen every minute?

A cathode ray tube (CRT) is a device that produces a focused beam of electrons in a vacuum. The electrons strike a phosphor-coated glass screen at the end of the tube, which produces a bright spot of light. The position of the bright spot of light on the screen can be adjusted by deflecting the electrons with electrical fields, magnetic fields, or both. Although the CRT tube was once commonly found in televisions, computer displays, and oscilloscopes, newer appliances use a liquid crystal display (LCD) or plasma screen. You still may come across a CRT in your study of science. Consider a CRT with an electron beam average current of 31.00 μA. How many electrons strike the screen every minute?

Principles of Physics: A Calculus-Based Text

5th Edition

ISBN:9781133104261

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter22: Magnetic Forces And Magnetic Fields

Section: Chapter Questions

Problem 72P

See similar textbooks

Similar questions

Professor Edward Ney was the founder of infrared astronomy at the University of Minnesota. In his later years, he wore an artificial pacemaker. Always an experimentalist, Ney often held a strong laboratory magnet near his chest to see what effect it had on his pacemaker. Perhaps he was using the magnet to throw switches that control different modes of operation. An admiring student (without an artificial pacemaker) thought it would be fun to imitate this great man by holding a strong magnet to his own chest. The natural pacemaker of the heart (known as the sinoatrial node) carries a current of about 0.5 mA. Estimate the magnetic force exerted on a natural pacemaker by a strong magnet held to the chest. How do you think the student might have felt during the experiment? Explain your geometric assumptions. Hints: See Table 30.1 (page 941) to estimate the magnetic field, and assume the field is roughly uniform. Use Figure P30.58 to estimate the size of the sinoatrial node; your heart is about the size of your fist. FIGURE P30.58
A laser beam with an electric field amplitude of 500.0 V/m and a beam radius of 1.00 mm is incidently on a perfectly absorbing surface. How much energy in (mJ) is completely absorbed in 60.0 s? (answer is in 3 significant figures) 1 mJ= 1x10^-3 J
The light beam from a search light may have an electric-field magnitude of 1000 V/m, corresponding to a potential difference of 1500 V between the head and feet of a 1.5-m-tall person on whom the light shines. Does this cause the person to feel a strong electric shock? Why or why not?
Question: The electronic structure of atoms and molecules may be investigated using photoelectron spectroscopy. An electron in a photoelectron spectrometer is accelerated from rest by a uniform electric ﬁeld to a speed of 420 km s−1 in 10 µs. Determine the kinetic energy of the electron?
A particular species of copepod, a small marine crustacean, emits a flash of light consisting of 1.4 x 1010 photons at a wavelength of 490 nm. The flash lasts for 2.4 s. What is the power of the flash?
In the determination of the capacitance of a capacitor experiment: Use the following data to find the capacitance C. |V(VOLT) |1.2 1.4 1.6 1.8 2 IX0.01 |(Amp) | 1.6 1.8 2 2.3 2.6 f= 50 Hz | Xe = ohm | C = µF. %3D
Mammography is an x-ray imaging procedure for breast cancer diagnosis and screening. Assume that 20ke V x-ray is used in mammography. Also assume that the breast of a patient is 6 cm in thickness (soft tissue), and the propagation speed of x-ray photons in soft tissue is about the same as in vacuum. How long will it take for x- ray photons to travel through the breast?
An argon-ion laser produces a cylindrical beam of light whose average power is 0.936 W. How much energy is contained in a 2.33-m length of the beam? Number i Units 12 +
17. At what rate must the potential difference between the plates of a parallel-plate capacitor with a 2.2 µF capacitance be changed to produce a displacement current of 2.1 A? (a) 8.6x105 V/s(b) 9.0x105 v/s(c) 9.5x106 V/s(d) 8.2x106 V/s(e) None of the above
Due to collisions in a wire, the electron’s overall speed or drift speed is very slow (about 1x10-5 m/s). How then does a light turn on almost instantly when the switch is flipped?
1. An air-filled parallel plate capacitor is being charged. As a result the electric field between the plates is increasing as follows: E(t) = (2.00 x 1014 v/m-s)t, where t is time in seconds. The area of each %3D plate is 100 cm?. What is the displacement current between the plates (in A)? (A) 5.54 (B) 8.00 (C) 12.5 (D) 17.7 (E) 22.3 (F) 26.0
In experiment 8, we measure the current drawn from a signal generator. According to the multimeter below, what is the maximum current supplied by the signal generator? Choose the closest value to your answer. 6. 4. 8 L.. CAT 30N max 2 10 ~ויויויוי 2 2 6 4 2 8. 3 10 8 10 METRA max 2