Two radio antennas are 120 m apart on a north-south line, and they radiate in phase at a frequency of 3.4 MHz. All radio measurements are made far from the antennas
If the east-west reference line passes midway between the two antennas, what is the smallest angle from the antennas, measured north of east, at which constructive interference of two radio waves occurs? (c = 3.00 × 108 m/s) A) 43°
B) 22°
C) 68°
D) 47°
E) 30°
D
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According to the theory of cosmic inflation, during a brief early "inflationary period," the universe
A) expanded at lightspeed. B) expanded at a speed that exceeded lightspeed. C) expanded at a speed that was only slightly slower than lightspeed. D) quickly became far more densely filled with matter. E) quickly became far more densely filled with energy.
Two organ pipes, a pipe of fundamental frequency 440 Hz, closed at one end, and a pipe of fundamental frequency 660 Hz, open at both ends, produce overtones. Which choice below correctly describes overtones present in both pipes?
a. After the first overtone of each pipe, every second overtone of the first pipe matches every second overtone of the second pipe. b. After the first overtone of each pipe, every second overtone of the first pipe matches every third overtone of the second pipe. c. After the first overtone of each pipe, every third overtone of the first pipe matches every second overtone of the second pipe. d. After the first overtone of each pipe, every second overtone of the first pipe matches every fourth overtone of the second pipe. e. After the first overtone of each pipe, every third overtone of the first pipe matches every fourth overtone of the second pipe.
The nucleus of an atom is charged negatively.
Indicate whether the statement is true or false.
Why do population II stars contain almost nothing but hydrogen and helium?
What will be an ideal response?