The density of air at room temperature is about 1.2 g/cm3. This is the same as
A) 12 kg/m3.
B) 120 kg/m3.
C) 1200 kg/m3.
Answer: C
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Which of the following statements is true of the third reaction in the proton-proton chain?
A) It yields a helium atom. B) It emits a neutrino. C) It emits a gamma ray. D) It yields carbon dioxide.
Which one of the following is true for the wavelength of the photon emitted when an electron in a hydrogen atom jumps from the ni = 70 state to the nf = 2 state
as compared to the wavelength of the photon emitted when the electron jumps from the ni = 4 state to the nf = 2 state? A) They are equal. B) It is shorter. C) It is longer. D) The wavelength of the photon is not related to the change in state.
Escape speed from Earth is
A) 8 km/s. B) 9.8 km/s. C) 11.2 km/s. D) 42.2 km/s.
A ‘cliff diver' in Mexico dives off a high cliff and falls for 2.3 seconds before hitting the water. (a) How fast is the diver going at impact? (b) How far below the cliff is the diver at this point?