If you are in the Moon's umbral shadow, then you will witness:
A) nighttime.
B) a total solar eclipse.
C) a total lunar eclipse.
D) a partial solar eclipse.
E) some kind of lunar eclipse.
B
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Relative to the stars, the moon moves about _________ eastward in the sky each night
a. 1° b. 5° c. 13° d. 27.3° e. 29.5°
Giant molecular cloud complexes are located in spiral arms
Indicate whether the statement is true or false
A neon light (thin hot neon gas in a sealed tube) gives us:
A) a continuous spectrum, since the neon is hot enough to glow. B) a few bright emission lines, telling us the gas is neon. C) a continuum, with dark lines identifying the neon atoms that are present. D) a lot of random bright red lines due to the motion of the hot atoms. E) nothing visible to us, but a lot of infrared lines as heat.
An electron has a relativistic momentum of 1.1 × 10-21 kg ? m/s. What percent of its total energy is its kinetic energy?
(melectron = 9.11 ×10-31 kg, c = 3.0 × 108 m/s)