Which of the following statements about the moons of the jovian planets is true?
A) Most of the moons have the potato-like shapes of asteroids, but a few are large enough to be spherical in shape.
B) Even the biggest moons are smaller than any of the planets or dwarf planets in our solar system.
C) All of the moons are barren and essentially airless, like our own Moon.
D) The moons are made almost entirely of rock and metal.
A) Most of the moons have the potato-like shapes of asteroids, but a few are large enough to be spherical in shape.
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An electron is moving with the speed of 1780 m/s
What is its de Broglie wavelength? (melectron = 9.11 × 10-31 kg, h = 6.626 × 10-34 J ? s) A) 409 nm B) 302 nm C) 205 nm D) 420 nm E) 502 nm
The half-life of 20F is 11 s. What fraction of a sample of 20F will remain after 44 s have elapsed?
a. 1/4 b. 1/16 c. 1/8 d. None of these
A package of supplies is dropped from a plane, and one second later a second package is dropped. Neglecting air resistance, the distance between the falling packages will
A) depend on their weight. B) decrease. C) increase. D) be constant. E) be gt2.
The majority of the radiation emitted to the general public in the normal operation of a nuclear plant comes from the ________
a. cooling water discharged to a lake or a river. b. reactor core directly. c. spent fuel rods stored on site. d. fission fragment gases vented to the atmosphere. e. low level wastes shipped from the plant