A transistor consists of
A. a layer of n-type semiconductor.
B. a layer of p-type semiconductor.
C. a combination of 2 doped layers, p and n.
D. a combination of 3 doped layers, such as n-p-n.
Answer: D
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The energy in the Sun's core is produced by
A. the chemical reaction of hydrogen and helium. B. the release of gravitational potential energy. C. the fusion of hydrogen to helium. D. radioactive decay.
Which statement best describes what was called the solar neutrino problem?
A) Early experiments designed to detect solar neutrinos found them, but in fewer numbers than had been expected. B) It referred to the fact that neutrinos are extremely difficult to detect. C) Our understanding of fusion in the Sun suggested that neutrinos should be destroyed before they arrive at Earth, yet neutrinos were being detected. D) No one understood how it could be possible for neutrinos to be produced in the Sun.
A hobbyist launches a projectile from ground level on a horizontal plain. It reaches a maximum height of 72.3 m and lands 111 m from the launch point. Assume no air. What was the angle of launch if g = 9.80 m/s2?
A) 69.0° B) 67.4° C) 22.6° D) 44.8°
One of the harmonics of a column of air open at one end and closed at the other has a frequency of 448 Hz and the next higher harmonic has a frequency of 576 Hz. What is the fundamental frequency of the air column?
A) 32 Hz B) 64 Hz C) 88 Hz D) 128 Hz E) 256 Hz