1. Which of the following frequencies falls in the range of RF wavws used by commerical radio broadcasting stations
a. .60 HZ
b. 6,00 HZ
c. 600.00 HZ
d. 6,000,000 HZ
2. In a cathrode ray tube, the number of electrons that reach the fluorescent screen is controlled by the
a. anode
b. cathrode
c. deflecting plate
d. grid
3. The function of a capacitor in an electric circuit is to
a. allow current flow between it plates
b. measure the amount of curent in the curcuit
c. increase circuit power
d. store electric changes
4.To use your left hand to determine the direction of the voltage developed in a moving conductor in a stationary magnectic field, you must point your
a. thumb in the direction of the magnetic flux
b. thumb in the direction of the electromagnectic force
c. forefinger in the direction of the lines of force
d. forefinger in the direction of the motion
I will be happy to critique your thinking on these. All have a straighforward answer. On number two, remember what the grid in any vacumn tube does.
1. Read the site I have provided, but beware of the difference between HZ KHZ and MHZ and choose your answer:
http://www.wisegeek.com/what-is-rf.htm
3. go to the following link:
http://en.wikipedia.org/wiki/Capacitor
2. Yopur exact answer is here:
http://66.102.7.104/search?q=cache:Nr8mP1Y9wa0J:wps.aw.com/wps/media/objects/877/898586/topics/topic07.pdf+%22cathode+ray+tube%22+%22number+of+electrons%22+%22fluorescent+screen%22+anode+plate+grid&hl=en&gl=us&ct=clnk&cd=1
1. Read the site I have provided, but beware of the difference between HZ KHZ and MHZ and choose your answer:
http://www.wisegeek.com/what-is-rf.htm
3. go to the following link:
http://en.wikipedia.org/wiki/Capacitor
2. Yopur exact answer is here:
http://66.102.7.104/search?q=cache:Nr8mP1Y9wa0J:wps.aw.com/wps/media/objects/877/898586/topics/topic07.pdf+%22cathode+ray+tube%22+%22number+of+electrons%22+%22fluorescent+screen%22+anode+plate+grid&hl=en&gl=us&ct=clnk&cd=1
1. The correct answer is d. 6,000,000 Hz. To determine this, you need to understand the frequency range used by commercial radio broadcasting stations. You can find this information on the website provided (http://www.wisegeek.com/what-is-rf.htm). The key is to be aware of the difference between HZ, KHZ, and MHZ. Radio frequencies are typically measured in megahertz (MHz), and the website explains that FM radio stations broadcast between 88 and 108 MHz. Therefore, the frequency that falls within this range is 6,000,000 Hz, or 6,000,000 Hz = 6,000 KHz = 6 MHz.
2. The correct answer is d. grid. To understand this, you can refer to the provided link (http://66.102.7.104/search?q=cache:Nr8mP1Y9wa0J:wps.aw.com/wps/media/objects/877/898586/topics/topic07.pdf+%22cathode+ray+tube%22+%22number+of+electrons%22+%22fluorescent+screen%22+anode+plate+grid&hl=en&gl=us&ct=clnk&cd=1). In a cathode ray tube, the grid is responsible for controlling the number of electrons that reach the fluorescent screen. By altering the voltage applied to the grid, the electron beam can be controlled and manipulated.
3. The correct answer is d. store electric charges. To understand the function of a capacitor in an electric circuit, you can refer to the provided link (http://en.wikipedia.org/wiki/Capacitor). A capacitor is an electronic component that stores electric charges. It consists of two plates separated by an insulating material, and when a voltage is applied to the capacitor, charges accumulate on the plates. These charges can be discharged later, providing a source of stored energy in the circuit.
4. The correct answer is c. forefinger in the direction of the lines of force. To determine the direction of the voltage developed in a moving conductor in a stationary magnetic field using your left hand, you can follow the "left-hand rule." Point your forefinger in the direction of the lines of force in the stationary magnetic field. Point your thumb in the direction of the motion of the conductor. The direction your middle finger points will indicate the direction of the voltage developed in the conductor. Therefore, the correct answer is c.