A less intense sonic boom at ground level can occur if the aircraft
A) is smaller.
B) flies higher.
C) is more streamlined.
D) all of the above
E) none of the above
Answer: D
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Which of the following statements about electrons is not true?
A) Electrons orbit the nucleus rather like planets orbiting the Sun. B) Within an atom, an electron can have only particular energies. C) An electron has a negative electrical charge. D) Electrons have little mass compared to protons or neutrons. E) Electrons can jump between energy levels in an atom only if they receive or give up an amount of energy equal to the difference in energy between the energy levels.
A 400-m tall tower casts a 600-m long shadow over level ground. At what angle ? is the sun elevated above the horizon?
A) 33.7° B) 41.8° C) 48.2° D) 65.1° E) Can't be found; not enough information.
Comets with extremely elliptical orbits, like comets Hyakutake and Hale-Bopp,
A) come from the asteroid belt. B) come from the Kuiper belt. C) come from the Oort cloud. D) are Trojan comets. E) are captured by Jupiter.
Cosmic rays originate in the
A) Earth's interior. B) Earth's upper atmosphere. C) Sun. D) cosmos. E) none of the above