What satellite revealed the most about cosmology, and why was it so effective?
What will be an ideal response?
COBE is the "Cosmic Observer of the Background Energy", and focused on the structure of the microwave cosmic background; its discovery of ripples in 1992 showed how the seeds of galaxies were sown in the early universe. The WMAP spacecraft made much more detailed measurements of the cosmic microwave background, confirming and extending COBE's results.
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According to the planetary model, an atom is
A) made of protons, electrons, and ions. B) made of protons and electrons. C) impossible to visualize [or picture]. D) a single tiny object, not made of parts. E) made of protons, electrons, and neutrons.
In a test of equipment the following procedure is carried out. Spacecraft ?1 is traveling at 0.75c and fires a laser pulse in the forward direction at Spacecraft ?2, which is testing its device that measures the speed of laser pulses as they pass by the spacecraft. Spacecraft ?2 is traveling at 0.95c in a direction away from Spacecraft ?1 . The device is working properly, and the speed of
the pulse as it passes is successfully measured. What is the speed of the laser pulse measured in this case? a. 0.80c b. 0.70c c. c d. This is a question that cannot be answered without knowing in which reference frames the speeds given in the problem. If you agree, then this is the answer that you should choose.
When an unstable nucleus decays by emitting an alpha particle, the atomic mass number of the nucleus
A) increases by 4. B) increases by 2. C) decreases by 2. D) decreases by 4. E) remains unchanged.
What kind of object does a main sequence star become on first using up its core hydrogen?
A. a red giant B. a protostar C. a supernova D. a planetary nebula E. a white dwarf