Two radio antennas are 120 m apart on a north-south line. The two antennas radia
ID: 1277271 • Letter: T
Question
Two radio antennas are 120 m apart on a north-south line. The two antennas radiate in phase at a frequency of 5.6 MHz. All radio measurements are made far from the antennas. The smallest angle, reckoned north of east from the antennas, at which destructive interference of the two radio waves occurs, is closest to: Select one: a. 16 b. 13 c. 6.4 d. 19 e. 9.7 Two radio antennas are 120 m apart on a north-south line. The two antennas radiate in phase at a frequency of 5.6 MHz. All radio measurements are made far from the antennas. The smallest angle, reckoned north of east from the antennas, at which destructive interference of the two radio waves occurs, is closest to: Select one: a. 16 b. 13 c. 6.4 d. 19 e. 9.7 Two radio antennas are 120 m apart on a north-south line. The two antennas radiate in phase at a frequency of 5.6 MHz. All radio measurements are made far from the antennas. The smallest angle, reckoned north of east from the antennas, at which destructive interference of the two radio waves occurs, is closest to: Select one: a. 16 b. 13 c. 6.4 d. 19 e. 9.7 Select one: a. 16 b. 13 c. 6.4 d. 19 e. 9.7 a. 16 b. 13 c. 6.4 d. 19 e. 9.7Explanation / Answer
? = 300,000,000/5,600,000 = 3000/56 m
?/2 = 1500/56
200/? = 56/15 cycles
Now the question becomes, "measured North of East from where?".
Destructive interference occurs when 1/(n?)^2 = 1/(?(m + 1/2)^2, or 1/(n)^2 = 1/(m + 1/2)^2
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