Which among the following waves is used for communication by artificial satellites ?
1). Microwaves
2). Radio waves
3). A. M.
4). Frequency of 101 series
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1. The group of solar cells joined together in a definite pattern is called a
2. Refrigeration is a process which
3. The washing machine works on the principle of
5. Which of the following statements is true when we see ''rainbow' ?
6. The force which makes a vehicle to stop when break is applied is called
7. The Doppler's effect is applicable?for
8. Electrostatic precipitator is used to control the pollution of
9. The average kinetic energy of the molecules of an ideal gas is directly proportional to