Stars in a star cluster
a. all have the same age.
b. all have the same chemical composition.
c. all have the same luminosity.
d. all of the above.
e. all have the same age and all have the same chemical composition.
e
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The wave function as derived in Schrödinger's equation is best described as being a measure of which of the following?
a. particle wavelength c. probability b. photon wavelength d. photon beam frequency
What is the mass of an electron in MeV/c2?
a. 0.511 MeV/c2 b. 105.7 MeV/c2 c. 1777 MeV/c2 d. none of the above
Why are fossils of early life on Earth more rare than fossils of plants and animals from the past few hundred million years?
A) Life was far less abundant prior to a few hundred million years ago. B) Early organisms lacked skeletons and other hard structures that are most likely to be fossilized. C) Fossils could not form before there was oxygen in the atmosphere. D) We find fossils in sedimentary layers, and no sediments were deposited until just a few hundred million years ago.
An insulator has a positive electric charge of 2.4 × 10^ -17 C. How many electrons were added or removed?