Which of the following statements about neutrinos is true?
A) Neutrinos can be attracted or repelled by electrically charged particles.
B) Neutrinos have a mass that is much larger than the mass of an electron.
C) Neutrinos respond to the strong nuclear force.
D) There are three types of neutrinos, and these represent three of the six known types of lepton.
E) Neutrinos respond to the force of gravity.
E) Neutrinos respond to the force of gravity.
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At the center of our galaxy, ____
a. material is available to make stars but the region is too cold to support star formation b. large stars are formed by the collision of smaller stars c. stars form at the same rate as they do in the spiral arms d. there is no star formation since there is no gas present e. there is evidence of recent, rapid star formation and supernova explosions
Why is the radiation so intense in the region that traces Io's orbit around Jupiter (the Io torus)?
A) The region is full of gases that become ionized after they are released from volcanoes on Io. B) Io's gravity allows this region to capture huge numbers of charged particles from the solar wind. C) An orbital resonance between Io, Europa, and Ganymede makes the radiation intense. D) Jupiter's strong magnetic field makes the radiation intense everywhere, and the region around Io is no different than any other region.
Of normal matter, about 25% of it by mass is still primordial helium even today
Indicate whether the statement is true or false
According to special relativity, two events that occur simultaneously in one frame of reference
A) are also simultaneous in all frames of reference. B) can be non-simultaneous in another frame of reference. C) is evidence for the constant speed of light. D) are in reality non-simultaneous.