Q.1.
Which of the following members of the electromagnetic spectrum has the highest frequency?
Q.2.
Why do some people object to mobile telephone masts being erected near their homes?
Q.3.
Why are microwaves used for communicating with satellites?
Q.4.
Which of the following is a disadvantage of wireless communication?
Q.5.
Which of the following is used in remote control devices for TV's, radios and similar appliances?
Q.6.
Which of the following members of the electromagnetic spectrum has the longest wavelength?
Q.7.
Which type of electromagnetic radiation travels the slowest?
Q.8.
Which of the following is a way that infrared radiation is used to transmit or receive information?
Q.9.
Which type of electromagnetic radiation can be reflected by the ionosphere, a layer of charged particles in the Earth's atmosphere?
Q.10.
Why do mobile telephone users need to be in line of sight with a transmitter to get a signal?