The type of EM waves used in radar is
a. ultraviolet.
b. infrared.
c. x-ray.
d. microwave.
e. blackbody.
d
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Which part of the electromagnetic spectrum has the shortest wavelength?
A) radio B) infrared C) ultraviolet D) visible E) gamma
Spiral density wave theory and self-sustaining star formation are ways to explain why ____
a. stars orbit the galaxy with different periods at different distances from the center b. sun-like stars are evenly distributed through the disk of the galaxy c. dark matter affects the orbit of stars outside the visible disk of the galaxy d. molecular clouds are compressed forming young stars along spiral arms e. the central bulge of the galaxy has a "bar" shape
A gas heater warms a room mostly through
A. convection B. conduction C. radiation D. depletion
An annular eclipse
A. occurs when the Moon's shadow does not completely reach Earth during a solar eclipse. B. occurs when Earth's shadow does not completely reach the Moon during a lunar eclipse. C. is a lunar eclipse that happens every November. D. is a solar eclipse that happens every November.