CHAPTER 8 :
ELECTRONIC AND INFORMATION AND COMMUNICATION SYSTEM
1 (a) the voltage of source of current
(b) source of
current
(c) the bulb lighted
up continuously when the switch is on
(d) capacitor allows
alternate current to flow through it but prevents direct current to flow
through it
(e) flow the
unwanted radio signal to earth
2) (a) (i) Intelsat I, Intelsat II, Intelsat III
(ii) It can cover communication system of all
places of the world
(b) (i) It is a
satellite that orbits round the earth in the same direction and velocity as the
Earth's rotation
(ii) The satellite
is always on the same spot above the earth
(c) Build an earth
satellite station in a suitable place in the country
(d) weather forecast / research / navigation
3)(a) (i) Long Wave /
Medium Wave
(ii)The wave is easily diffracted
(b) Ionosphere
(c) Method B
(d) (i)
Very High Frequency / Ultra High Frequency / Microwave
(ii) It has high frequency and is not reflected by the
ionosphere
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