A solar eclipse that occurs when the Moon's umbra does not reach Earth's surface is called
a. a total solar eclipse.
b. a partial solar eclipse.
c. an annular solar eclipse.
d. a penumbral solar eclipse.
e. an umbral solar eclipse.
c
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Refracting Telescope: You have available lenses of focal lengths 2.0 cm, 4.0 cm, 8.0 cm, and 16 cm. If you could use any two of these lenses to build a telescope, what is the lens separation for the telescope to provide the maximum magnification for comfortable viewing of a planet?
A. 10.0 cm B. 12.0 cm C. 18.0 cm D. 24.0 cm
Mineralogical analysis of a rock can tell us
A) the detailed geological history of the rock B) what the rock is made of C) when the rock formed D) the temperature and pressure conditions under which it formed
In gaseous form at the same temperature, the average speed of U-238 compared to the speed of U-235 is
A) less. B) more. C) the same.
The red line in the helium spectrum is closer to orange than the red line in the hydrogen spectrum, indicating that it has a higher frequency. Therefore, the photons of red light emitted by helium have __________ energy than those emitted by hydrogen
a. lower b. higher c. the same d. more ionization