In satellite communication,the uplink frequency band used is

In frequency modulation,

Television signals broadcast from the moon can be received on the earth,while the $TV$ broadcast from Delhi cannot be received at places about $100 \, km$ distant from Delhi. This is because:

In amplitude modulation,

Which of the following modulated signals has the best noise tolerance?

If the frequencies of the carrier wave and message signal are $1 \text{ MHz}$ and $28 \text{ kHz}$ respectively,then the frequencies of the side bands are