The term "solid-state electronics" refers to
A. the replacement of positive charges with electrons in devices.
B. the increased use of metals in electronic devices.
C. our ability to now use solids to make electronic devices.
D. the use of transistors rather than vacuum tubes.
Answer: D
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Which of the following statements is true?
A. Even though X-rays have higher energy, they move with the same speed as that of visible light. B. X-rays have higher energy, but still they move slower than visible light. C. X-rays have higher energy, hence they move faster than visible light. D. None of these choices are correct.
Chemical rockets work on which basic physical principle?
A) Kepler's first law of planetary motion B) Einstein's special theory of relativity C) Newton's third law of motion D) the law of conservation of energy
Currently, the largest optical telescope mirrors have a diameter of
A) 1 m. B) 2 m. C) 5 m. D) 10 m. E) 100 m.
A airplane that is flying level needs to accelerate from a speed of 2.00 × 102 m/s to a speed of 2.40 × 102 m/s while it flies a distance of 1.20 km. What must be the acceleration of the plane?
A) 4.44 m/s2 B) 2.45 m/s2 C) 7.33 m/s2 D) 5.78 m/s2 E) 1.34 m/s2