The more baryons there are in the universe (a higher density of baryonic matter), the lower the ratio of deuterium to hydrogen is. Therefore, if Harry measures a higher ratio of deuterium to hydrogen than Sally, Harry infers
A) a higher density of baryons than Sally.
B) the same density of baryons as Sally.
C) a lower density of baryons than Sally.
C
You might also like to view...
What is the hohlraum?
What will be an ideal response?
Which of the following best describes the nature and origin of the atmospheres of the Moon and Mercury?
A) They have thin tropospheres only, with gas coming from evaporation and sublimation. B) They have thin exospheres only, with gas coming from impacts of subatomic particles and photons. C) They have only small amounts of gas, all of which is leftover from outgassing long ago. D) They have very thin atmospheres produced by outgassing, but still have the layers of a troposphere, thermosphere, and exosphere.
A light source blinks once per second in its own frame of reference. As you approach the blinking source, you observe the frequency of blinks to be
A) less than 1 Hz. B) 1 Hz. C) more than 1 Hz.
The boundary between the half of the Earth in sunlight and the half of the Earth in darkness is the __________
What will be an ideal response?