A throbbing pulse of electromagnetic radiation is called a
A) proton.
B) photon.
C) phototron.
D) newtron.
E) nooytron.
Answer: B
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Indicate whether the statement is true or false
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A.) Photons and electrons. B.) Photons, gravitons, and strange quarks. C.) Protons, neutrons, and electrons. D.) Positrons and electrons. E.) Neutrons, photons, and W bosons.
Voids contain about what percentage of the universe's mass?
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A horizontal uniform meter stick supported at the 50-cm mark has a mass of 0.50 kg hanging from it at the 20-cm mark and a 0.30 kg mass hanging from it at the 60-cm mark. Determine the position on the meter stick at which one would hang a third mass of 0.60 kg to keep the meter stick balanced
a. 74 cm b. 70 cm c. 65 cm d. 86 cm e. 62 cm