The sunlight we receive on Earth originates from the Sun's
A. radiative zone.
B. photosphere.
C. corona.
D. chromosphere.
Answer: B
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Why couldn't life originate on the Moon?
a. too many craters b. not within a habitable zone in the Solar System c. lack of atmosphere to keep water on its surface d. lack of oxygen in its atmosphere e. too cold a surface
When air is cooled below its dew point without condensation, it is said to be
a. wet. b. dry. c. supersaturated. d. unsaturated.
The half-life of 18N is 0.62 s. What is the decay constant for this isotope?
a. 0.43 s–1 b. 1.1 s–1 c. 1.7 × 10^–11 Ci d. The decay constant is not defined for a half-life of less than one second.
An LR circuit is prepared for an experiment, initially with its switch open. The time constant is that time after switch closure at which the energy stored in the inductor reaches what percentage of its final value
A. 63% B. 14% C. 37% D. 40% E. 100%