The only planet with no atmosphere of consequence is
A) Earth. B) Pluto. C) Venus. D) Mars. E) Mercury.
E
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Radioactive Decay: One material used in nuclear bombs is 239Pu, with a half-life of 24,000 years. How long must we wait for a buried stockpile of this substance to decay to 1/1000 of its original activity?
A. 1,200,000 years B. 240,000 years C. 150,000 years D. 82,000 years E. 1500 years
An object in the sky brightens suddenly, but shows no hydrogen lines in its spectrum. It is most likely a(n):
A) comet. B) type I supernova. C) type II supernova. D) asteroid impact. E) stellar collision.
A child is drinking a liquid with a straw. Which of the following statements is true?
A. Longer straws work better because the pressure is larger deeper down B. The fluid is being pulled up into the straw C. The pressure inside the straw depends on the viscosity of the liquid D. The pressure in the straw is reduced and the liquid is pushed upward by atmospheric pressure on the surface of the liquid
In a transition from one vibrational state to another, a molecule emits a photon of wavelength 5.56 µm
What is the energy difference between these two states? (c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J) A) 13.6 MeV B) 13.6 eV C) 0.223 eV D) 0.223 MeV E) 2.23 MeV