The case of Mars tells us that which of the following is a critical factor in determining surface habitability?
A) planetary size
B) levels of geological activity
C) distance from the Sun
D) the presence of a magnetic field
A
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Describe how the gravitational forces from the Sun and the Moon compare from one side of Earth to the other.
a. The Sun exerts a stronger force on the side of Earth furthest from the Sun, and the Moon exerts a stronger force on the side nearest the Moon. b. The Sun exerts a stronger force on the side of Earth nearest the Sun, and the Moon exerts a stronger force on the side nearest the Moon. c. The Sun exerts a stronger force on the side of Earth furthest from the Sun, and the Moon exerts a stronger force on the side furthest from the Moon. d. The Sun exerts a stronger force on the side of Earth nearest the Sun, and the Moon exerts a stronger force on the side furthest from the Moon
How much energy is released in the reaction 2H + 2H ? 4He? [m(2H) = 2.012102 u, m(4He) = 4.002603 u]
A) 20 MeV B) 18 MeV C) 13 MeV D) 12 MeV E) 36 MeV
A hydrogen atom emits a photon of wavelength 657.7 nm. From what energy state to what lower energy state did the electron jump?
Exclusion Principle: Neon has 10 electrons. What is the value of Z of the next higher element that has chemical properties very similar to those of neon?
A. 11 B. 17 C. 18 D. 19 E. 36