The ______________ occurs on June 21
a. autumnal equinox
b. winter solstice
c. summer solstice
d. vernal equinox
c
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The electric field in a cathode ray tube is supposed to accelerate electrons from 0 to 3.2 × 10^7 m/s in a distance of 2.00 cm. What electric field is required? (me = 9.11 × 10^?31 kg and e = 1.60 × 10^?19 C)
a. 4.6E+4 N/C b. 2.3E+5 N/C c. 1.5E+5 N/C d. 2.9E+5 N/C e. 1.6E+4 N/C
When is the north polar axis tilted most toward the Sun?
What will be an ideal response?
Why might inflation have occurred at the end of the GUT era?
A) Gravity was an extremely weak force at this period in time. B) Large amounts of matter and antimatter annihilated at this time. C) There wasn't enough matter present to slow down the expansion at that time. D) The universe was too small and needed to grow quickly. E) An enormous amount of energy was released when the strong force froze out from the GUT force.
Emission is called fluorescence if the decay time is less than _________ seconds.
Fill in the blank(s) with the appropriate word(s).