Physical science

posted by Mary

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

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