Comets are solid objects
a. True
b. False
Indicate whether the statement is true or false
False
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An object is placed 10 cm in front of a concave mirror of focal length 30 cm. The image will be formed
A. 15 cm behind the mirror. B. 20 cm in front of the mirror. C. 20 cm behind the mirror. D. 0.05 cm behind the mirror. E. 15 cm in front of the mirror.
A radar installation operates at 9 000 MHz with an antenna (dish) that is 15 meters across. Determine the maximum distance (in kilometers) for which this system can distinguish two aircraft 100 meters apart
a. 7.4 km b. 370 km c. 3700 m d. 37 km e. 740 km
In a resonating pipe that is open at one end and closed at the other, there
A) are displacement nodes at each end. B) are displacement antinodes at each end. C) is a displacement node at the open end and a displacement antinode at the closed end. D) is a displacement node at the closed end and a displacement antinode at the open end.
The sweeping of atmospheric gas particles into space by the Sun is referred to as
A) a solar flare B) solar wind stripping C) evaporation D) thermal escape