What happens to the half-life of a radioactive substance as it decays?
A) It remains constant.
B) It increases.
C) It decreases at a constant rate.
D) It decreases at an exponential rate.
A
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Which color of visible light carries the most energy per photon?
A) red B) green C) blue D) violet E) all the same
A spherical particle of density 
and 2.00-mm radius is located at the same distance from the Sun as the Earth (RSE = 1.5 × 1011 m, G = 6.67 × 10-11 Nm2/kg2, S? = 1365 W/m2?, M S = 1.99 × 1030 kg) . If the particle absorbs 100 percent of the sunlight reaching it, the ratio of the force exerted by the solar radiation to the force of gravity exerted on the particle by the Sun is
A. 5.8 × 10?5. B. 0.58. C. 1.0. D. 1.7. E. 1.7 × 104.
A "galactic fountain" is _____
a. a stream of gas and dust being pulled into a galaxy as it forms b. a jet of high-speed superheated material thrown out of the accretion disk around a black hole c. a partial spiral arm formed by the collision of molecular clouds d. a bubble of hot, metal-rich gas ejected from the disk by a burst of supernova e. a stream of gas made from a star that has been torn apart while falling into a supermassive black hole
Which of the following statements about Saturn's moon Titan is not true?
A) It rains liquid methane and ethane. B) Its atmosphere contains abundant oxygen. C) Its temperature is too cold for liquid water to exist on its surface. D) Its surface is hidden from view by a thick atmosphere. E) It orbits Saturn.