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Surya Kapadia
Asked: 2022-11-03T17:31:25+05:30 In:

Two towers on the top of two hills are 40 km apart. The line joining them presses 50 m above a hill half way between the towers. What is the longest wavelength of radiowaves which can be send between the towers without apprecialbe fiffraction effects?
A. 1.25 m
B. 0.125 m
C. 2.50 m
D. 0.250 m

Two towers on the top of two hills are 40 km apart. The line joining them presses 50 m above a hill half way between the towers. What is the longest wavelength of radiowaves which can be send between the towers without apprecialbe fiffraction effects?
A. 1.25 m
B. 0.125 m
C. 2.50 m
D. 0.250 m
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1 Answer

  1. Correct Answer – B
    Distance between one of the towers and hill half way `= 40//2km=2xx10^(4) km`
    ` :. z_(F)=2xx10^(4)km`
    Using, ` :. z_(F)=(a^(2))/(lambda) ” or ” lambda=(a^(2))/(z_(F))`
    ` :. lambda=((50)^(2))/(2xx10^(4))=1250xx10^(-4)=0.125m`

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