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MICROWAVES

 

Microwaves are different from ordinary radio waves; they have a higher frequency. They are also better for communication; they can carry many messages at the same time .

There is only one problem with microwaves .They can only travel in a straight line; they cannot travel in curved lines. In other words, they cannot follow the curvature of the earth. As a result, microwave stations are usually constructed every thirty or so miles from each other . Since it is impossible to build microwave stations in the ocean , a different method must be used for overseas communication . This is the communication satellite. With it , microwaves can be sent a very long distance and then bounced back to the earth.

A. Check the correct choice:

1. Microwaves differ from ordinary radio waves because …………….

                      a. they are more frequent                          b. they are much higher

                      c. their frequency is better                        d. their frequency is higher

2. The problem with microwaves is that they……….

                     a. only travel in circles                                b. only travel straight

                     c. follow the curves of the earth                  d. can not travel straight

3. Microwave stations are constructed every ........................... .

              a. 3 or so miles      b. 30 or so miles          c. 13 or so miles      d. 300 or so miles

4. Overseas communication is provided by ........................... .

               a. microwave stations in the ocean         b. microwave stations on mountains

               c. microwave stations in the sky           d. microwaves from the earth

5. The underlined " it " refers to …………….  .

                  a. a different method                           b. the oversea communication

                  c. the microwave station                    d. the communication satellite


[ جمعه 5 دی 1393 ] [ 07:30 ب.ظ ] [ خلیل عبداللهی ]
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