When we say that a cluster of galaxies is acting as a gravitational lens, what do we mean?
A) It magnifies the effects of gravity that we see in the cluster.
B) It is an unusually large cluster that has a lot of gravity.
C) It bends or distorts the light coming from galaxies located behind it.
D) The overall shape of the cluster is that of a lens.
C
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The Copernican model of the solar system has the planets orbit the Sun along elliptical paths
a. True b. False Indicate whether the statement is true or false
What features of the telescopic view of the Andromeda Galaxy, M-31, are also visible to the naked eye for our similar Galaxy?
What will be an ideal response?
Suppose one observes cosmic rays creating a new particle high in the atmosphere and the particle moves at 99.7% the speed of light. It is observed to decay in an average 37.0 ?s. What is the proper lifetime of the particle?
A) 2.86 ?s B) 4.33 ?s C) 18.1 ?s D) 12.4 ?s E) 5.33 ms
What should be the approximate diameter (in fm) of a nucleus containing 92 protons and 143 neutrons?
What will be an ideal response?