We live in the ______________ eon
Fill in the blank(s) with correct word
Phanerozoic
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At the microscopic level, electric currents in wires are due to
A) electromagnetic radiation. B) the great pumpkin. C) protons [and possibly other ions] traveling along the wire. D) atoms jiggling back and forth within the wire. E) electrons traveling along the wire.
Modern mammals are descendants of
A) birds that were able to survive the impact that wiped out the dinosaurs 65 million years ago B) sea animals that colonized the land after the impact that wiped out the dinosaurs 65 million years ago C) early mammals that lived under the ground that were able to survive the impact that helped to wipe out the dinosaurs 65 million years ago D) early mammals that killed off the dinosaurs
Most SETI searches are done at
A) X-ray wavelengths. B) visual wavelengths. C) infrared wavelengths. D) radio wavelengths. E) gamma wavelengths.
What do we mean by the diffraction limit of a telescope?
A) It is the maximum size to which any telescope can be built. B) It describes the farthest distance to which the telescope can see. C) It describes the maximum exposure time for images captured with the telescope. D) It is the best angular resolution the telescope could achieve with perfect optical quality and in the absence of atmospheric distortion.