4. Communication Satellite

Which of the following are electromagnetic waves?

• Longitudinal

• Ultraviolet

• Transverse

• Infrared

Wave is a phenomenon or disturbance in which ______ is transferred from one point to another. (Use a comma to separate answers as needed)

Mobile phones communicate by transmitting _____ waves through a network of fixed antennas called base stations.

In order for phones communication to work functionally, it needs ___________ (a), ____________ (b) and ____________(c). (Use a comma to separate answers as needed)

Below are the functions of satellite communication except...

• Receive instructions that are transmitted from the ground station.

• Capture and map images of the disaster on Earth

• Tracking by transmitting satellite position in space

• Collecting and transferring the mission data.

When we communicate online, we often face a problem where there is lag or bad connection. Why does that happen?

i. Low bandwidth or limited bandwidth

ii. High propagation delay

iii. Interferences or external disturbances

iv. Due to overcrowding channel in one satellite communication.

• i and ii only

• i, ii, and iii

• ii, iii, and iv

• i, ii, iii, and iv

How to minimize the delays or interferences that occur in satellite communication?

• Relay Satellite

• Use high frequency for communication satellite

• Use more than one bandwidth

One of the advantages of using satellites for communication purposes is_____.

• Very low bandwidth

• Satellite system has greater area coverage

• Satellite manufacturing requires more time.

 

Radio transmitter transforms ________ _____ from a power source, a battery or mains power, into a _____ frequency alternating current to apply to the antenna, and the antenna radiates the energy from this current as radio waves. (Use a comma to separate answers as needed)

The function of antennas in a phone is to ____________ in terms of radio waves before being transferred to the nearest tower or otherwise.