Fiber optics has to do with:
a. light having fiber characteristics as well as wave and particle characteristics.
b. the color of fabrics.
c. string theory.
d. none of the above.
D
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What conditions are necessary for an annular solar eclipse?
A) New Moon on equator at perigee B) Full Moon on ecliptic at perihelion C) New Moon on ecliptic at perigee D) New Moon on equator at apogee E) New Moon on ecliptic at apogee
For a capacitor in and ac circuit, how much energy is stored in the capacitor at the instant when current is zero?
A. 0.707 maximum B. half C. zero D. maximum
Which of the following must be true for differentiation to occur in a planet?
A) The planet must have a rocky surface. B) The planet must be made of both metal and rock. C) The planet must have an atmosphere. D) The planet must be geologically active, that is, have volcanoes, planetquakes, and erosion from weather. E) The planet must have a molten interior.
If the collapsing star is over 25 solar masses, the core may form ________ in a hypernova event
A) a gamma-ray burster B) a millisencond pulsar C) an X-rays burster D) a pulsar E) a black hole