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Propagation of radio-TV signals 1.        Ground waves have a wavelength (a)     Less than 200 m (b)    Equal to 200 m (c)     more than 200 m (d)    all of these Ans: ( c) 2.        sky wave have a wavelength (a)       Less than 200 m (b)    Equal to 200 m (c)     more than 200 m (d)    all of these Ans: ( b) 3.        Television signals reach us only through the ground waves. The range R related with the transmitter   height h is in proportion to (a)     h (b)    h 1/2 (c)     h -1/2 (d)    h -1 Ans: ( b) 4.        transmission via sky waves is impossible for the frequencies (a)     less than 40 MHz (b)    equal   to 40 MHz (c)  ...