Questions

h =   = 3 × 10⁸/10⁶ = 300 m

The path that data takes from source to destination is called a Channel. A channel is a communication medium. A channel has a certain capacity for transmitting information. 

The "capacity" of a channel is the theoretical upper-limit to the bit rate over a given channel that will result in negligible errors. Channel capacity is often measured by its Bandwidth in Hz or its data rate in bits per second.

Moving from one website to another is called Browsing.

Again, before you apply for a job to a call center you should be aware that most of the call centers cater to English speaking customers and this needs you to speak clear English without any grammatical mistakes.