What is the ionization energy of singly ionized helium?
A) 54.4 eV
B) 13.6 eV
C) 27.2 eV
D) 6.80 eV
E) 36.4 eV
A
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The order of evolutionary stages of a star like the Sun would be Main Sequence, giant, planetary nebula, and finally a ________
Fill in the blank(s) with correct word
Suppose you slowly, and at constant speed, lift a book weighing 12 N from the floor to a shelf 2 m above the floor. Neglect air resistance. The work done by you on the book is
A) 24 watts. B) 6 joules. C) 6 watts. D) 24 joules. E) zero.
The Moon's reflected image in a lake often appears as a vertical column when the water is
A) perfectly still. B) slightly rough. C) very rough, churning with waves.
Which of the following applies to Europa?
A) It is the most volcanically active body in the solar system. B) It is thought to have a deep, subsurface ocean of liquid water. C) It is the only moon in our solar system with an atmosphere thicker than Earth's atmosphere. D) It is the largest moon in the solar system. E) It is probably a captured Kuiper belt object.