Why is the possible contamination of the Earth by Martian microbes in a future sample return mission not considered to be a significant problem?
A) Martian microbes will certainly be destroyed by terrestrial microbes
B) any Martian microbes will be destroyed by high-energy particles and radiation on their trip back to Earth
C) Martian microbes will be rapidly destroyed by oxygen in the Earth's atmosphere
D) Martian microbes are likely to be quite different than terrestrial microbes and, hence, will probably not be able to affect life on Earth
D
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Exclusion Principle: In a hydrogen atom, an electron with n = 7 can exist in how many different quantum states?
A. 6 B. 7 C. 15 D. 98
A stellar core with a mass greater than 3 solar masses will collapse until it reaches _____
a. the radiusof Earth b. the radius of Mt. Everest c. the radius of a grain of sand. d. the radius of a helium atom e. a radius of zero
When you ride a bicycle, in what direction is the angular velocity of the wheels?
A) to your left B) to your right C) forwards D) backwards E) up
What is the minimum speed needed by a ground-state hydrogen atom for its kinetic energy to be enough to ionize the atom in a collision? (1 eV = 1.60 × 10-19 J, mH ? mproton = 1.67 × 10-27 kg)
A) 66.5 km/s B) 51.0 km/s C) 21.7 km/s D) 113 km/s E) 44.2 km/s