Suppose you are designing a device to transmit information without wires what part of the em spectrum will your device use and why

My device will use either radio waves or light waves.
Those are the only EM waves I'm equipped to generate.

If I want to get elegant about it, I may use radio waves with
frequencies around 14.1 MHz, because those can be received
many thousands of miles away.  I know how to build an effective
antenna to radiate at that frequency, and as a licensed ham-radio
operator, I can do it legally. 

Mass=52kg

Velocity=2.5m/s

Momentum=?

We know that,

Momentum=Mass × velocity

Or,momentum=52kg× 2.5m/s

Or,momentum=130 kgm/s

So,the momentum is 130 kgm/s.