Question

In satellite communication \(6 \mathrm{GHz}\) frequency is used for and $4 \mathrm{GHz}$ frequency is used for (A) uplink, down link (B) down link, up link (C) modulation, demodulation (D) demodulation, modulation

Short answer

In satellite communication, the 6 GHz frequency is used for uplink (transmission of data from Earth to the satellite), while the 4 GHz frequency is used for downlink (transmission of data from the satellite back to Earth). This is to avoid interference and signal attenuation. So, the correct answer is \( (A) \) uplink, downlink.

Step-by-step solution

Define Uplink and Downlink

Uplink refers to the transmission of data from the Earth to the satellite, while downlink refers to the transmission of data from the satellite back to Earth. In satellite communication systems, different frequencies are used for these two processes to avoid interference.

Compare the given frequencies

We are given two frequencies, 6 GHz and 4 GHz. Typically, uplink uses higher frequencies, while downlink uses lower frequencies. This is because signal attenuation (loss of signal strength) is higher at lower frequencies, and as the Earth is larger than the satellite, it usually requires greater signal strength to transmit.

Match the frequencies to uplink and downlink

Based on the information above, we can match the 6 GHz frequency to uplink, due to its higher frequency, and the 4 GHz frequency to downlink, due to its lower frequency.

Identify the correct answer

Now that we have matched the frequencies with their respective uplinks and downlinks, we can identify the correct answer from the options provided: (A) uplink, downlink (B) downlink, uplink (C) modulation, demodulation (D) demodulation, modulation As we found in Step 3, 6 GHz is used for uplink and 4 GHz is used for downlink. Therefore, the correct answer is (A) uplink, downlink.