Which of these is/are not true of nuclear fission reactors?
a. Their intended output is heat.
b. They produce the majority of the electric energy used in the world.
c. There is a small chance one could explode like an atom bomb.
d. Some can produce or "breed" more nuclear fuel than they consume.
B, C
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Consider how the Moon moves through the Solar System and complete the following sentence. The Moon orbits the Sun
A) once a month. B) once a year. C) once a day.
An electron moves in a region where the magnetic field is uniform and has a magnitude of 80 ?T. The electron follows a helical path which has a pitch of 9.0 mm and a radius of 2.0 mm. What is the speed of this electron as it moves in this region?
a. 48 km/s b. 28 km/s c. 20 km/s d. 35 km/s e. 8.0 km/s
The central cores of which type of star is the lowest temperature?
a. protostars. b. massive main-sequence stars. c. white dwarf stars.
An object is placed 10 cm in front of a mirror, and an image is formed that has a magnification of 3 . Which of the following statements is false?
a. The image is upright. b. The image is virtual. c. The focal length of the mirror is 15 cm. d. This is the only true statement.