Enrico Fermi was
A) the head of the program to develop the world's first fission bomb.
B) the head of the program to develop the world's first fusion bomb.
C) the inventor of radiation therapy.
D) the discoverer of nuclear fission.
E) the head of the program to develop the world's first nuclear reactor.
E
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Which of the following statements about neutrinos is not true?
A) About a thousand trillion neutrinos are passing through your body every second. B) Neutrinos are created as a by-product of the proton-proton chain. C) Neutrinos have no electrical charge. D) Neutrinos have a tendency to pass through just about anything without interactions, making them very difficult to detect. E) The mass of a neutrino is 30 percent of the mass of an electron.
The Orion Nebula, M-42, is a hot, thin cloud of glowing gas, so its spectrum is:
A) a continuum, strongest in the color red. B) a few bright lines against a dark background. C) a few dark lines in the continuum. D) a continuum, but with both bright and dark lines mixed in. E) not in the visible portion of the spectrum.
Does it make sense to say that a textbook is about 99.9 percent empty space?
A) No. A textbook is a solid and thus is quite dense. Therefore it is not 99.9 percent empty space. B) No. Only gases are considered to be 99.9 percent empty space. Liquids and solids are not. C) Yes. A textbook like all material things is made up of atoms, which are considered to be 99.9 percent empty space. D) No. A textbook could only be considered to be 99.9 percent empty space if it were combusted.
When the Moon passes directly between the Sun and the Earth, we see a lunar eclipse
Indicate whether the statement is true or false