the seawater itself: when a neutrino interacts with a
(40)particle in an atom of seawater. the result is a cascade of
electrically charged particles and a flash of light that can
be detected by the sensors. The five kilometers of sea-
water above the sensors will shield them from the interf-
ering effects of other high-energy particles raining down
(45) through the atmosphere.
The strongest motivation for the DUMAND project
is that it will exploit an important source of information
about the universe. The extension of astronomy from
visible light to radio waves to x-rays and gamma rays
(50) never failed to lead to the discovery of unusual objects
such as radio galaxies, quasars, and pulsars. Each of
these discoveries came as a surprise. Neutrino astronomy
will doubtless bring its own share of surprises.
1. Which of the following titles best summarizes the
passage as a whole?
(A) At the Threshold of Neutrino Astronomy
(B) Neutrinos and the History of the Universe
(C) The Creation and Study of Neutrinos
(D) The DUMAND System and How It Works
(E) The Properties of the Neutrino
2. With which of the following statements regarding
neutrino astronomy would the author be most likely
to agree?
(A) Neutrino astronomy will supersede all present
forms of astronomy.
(B) Neutrino astronomy will be abandoned if the
DUMAND project fails.
(C) Neutrino astronomy can be expected to lead to
major breakthroughs in astronomy.
(D) Neutrino astronomy will disclose phenomena that
will be more surprising than past discoveries.