1. Radio waves has the____wavelength in the electromagnetic
spectrum
A. shortest
B. smallest C. largest D. longest
2. Low frequency waves are suitable for communication over____
A. Short distances
C. great distances
B. Small distances
D. wide distances
3. The wave used in the application of satellite is called____
A. Magnetic wave
C. Infrared waves
B. Microwave
D. Bluetooth
4. The____sends out a narrow beam of microwaves in short pulses.
A. signal
B. system
C. transmitter D. radar
5. A cell phone is a radio___and___
that uses microwaves.
A. sender; receiver
C. Transmitter; receiver
B. sender; transmitter
D. Receiver; System
6. In a microwave oven, foods absorb certain microwave frequencies very____
A.Large
B.Great
C.Small
D.Strong
7.Infrared radiation lies beyond the
____end of the visible light
A.Blue
B.Green
C.Red
D.Violet​