Astronomers think of pulsars not as pulsing objects but rather as objects emitting beams
Indicate whether the statement is true or false
True
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Based on current scientific evidence, what is the likelihood that life on Earth was created by some omnipotent being?
A) very unlikely but not impossible B) impossible C) certain D) very likely
A beta particle is another name for a(n)
a. electron. b. proton. c. neutron. d. helium nucleus. e. photon.
Without glasses, a person can comfortably read a magazine when it is held at 60 cm from his eyes. What should be the focal length of his contact lenses to allow him to read the magazine comfortably at a distance of 30 cm?
A) -30 cm B) +30 cm C) -60 cm D) +60 cm E) +90 cm
Since atoms are mostly empty space, why don't objects pass through one another?
A) The electrons on the atoms repel other electrons on other atoms when they get close. B) The nucleus of one atom repels the nucleus of another atom when it gets close. C) The nucleus of one atom attracts the nucleus of a neighboring atom to form a barrier. D) The electrons of one attract the nucleus of a neighboring atom to form a barrier.