The solar neutrino problem referred to the fact that, a couple decades ago, fewer neutrinos were being detected from the Sun than predicted by our theory of nuclear fusion. What was the solution to this problem?
A) We learned that the Sun is generating energy by means other than nuclear fusion.
B) We learned that the Sun is generating much less energy than we thought it was.
C) We learned that our detectors were mistaking neutrinos for the particles known as cosmic rays.
D) We learned that our detectors were detecting only one of three different types of neutrinos that reach us from the Sun.
E) We learned that our detectors were not functioning properly.
D) We learned that our detectors were detecting only one of three different types of neutrinos that reach us from the Sun.
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In what direction does a comet's tail point?
A. along the comet's orbit in the direction the comet is moving B. toward the Sun, pulled by its gravity C. away from the Sun D. perpendicular to the comet's orbit E. trailing the comet in its orbit
Water runs out of a horizontal drainpipe at the rate of 120. liters per minute. It falls 3.20 m to the ground. Assuming the water doesn't splash up, what average force does it exert on the ground?
A) 12.0 N B) 19.6 N C) 15.8 N D) 8.88 N E) 6.20 N
The ________ star clusters are younger, and their stars richer in heavier elements released in supernova events
Fill in the blank(s) with correct word
You want to confine an electron in a box (an infinite well) so that its ground state energy is 5.0 × 10-18 J
What should be the length of the box? (h = 6.626 × 10-34 J ? s, mel = 9.11 × 10-31 kg) A) 0.11 nm B) 0.22 nm C) 0.15 nm D) 0.18 nm