_________ are used for cellular phone, satellite, and wireless LAN communications.

• Radio waves

• Infrared waves

• Microwaves

• none of the above

A parabolic dish antenna is a(n) ___________ antenna.

• unidirectional

• bidirectional

• omnidirectional

• horn

Transmission media are usually categorized as ___________.

• determinate or indeterminate

• fixed or unfixed

• guided or unguided

• metallic or nonmetallic

________ are used for short-range communications such as those between a PC and a peripheral device.

• Radio waves

• Infrared waves

• Microwaves

• none of the above

25. Microwaves are _________.

A)

B)

C)

D)

• omnidirectional

• bidirectional

• unidirectional

• none of the above

. Radio waves are _________.

• unidirectional

• omnidirectional

• bidirectional

• none of the above

-----------propagation, waves travel in a direct path from the source to the receiver

• Sky propagation

• Line of sight propagation

• Ground propagation

• All the above

Which type of propogation is this

• Sky wave propogation

• Ground propogation

• Line of Sight propogation

• Others

Which type of wave propagation is this?

• Sky wave propagation

• Ground wave propagation

• Line of sight propagation

• Others

Infrared waves cannot pass through walls or solid objects

• True

• False