The wavelength of light visible to the human eye is on the order of 5 × 10^-7 m. If the speed of light in air is 3 × 10^8 m/s, find the frequency of the lightwave
a. 3 × 10^7 Hz
b. 4 × 10^9 Hz
c. 5 × 10^11 Hz
d. 6 × 10^14 Hz
e. 4 × 10^15 Hz
D
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Fill in the blank(s) with the appropriate word(s).
A gravitational "sling-shot":
A) causes comets to crash into planets, such as Jupiter in 1994. B) allowed the Apollo astronauts to reach the Moon in 1969. C) is the accepted theory for the formation of the asteroid belt. D) changes the speed and direction of a spacecraft nearing a massive planet. E) explains how the solar system was formed after a near collision with another star.
Radioactivity in the world is something
A) relatively new. B) as old as the world itself. C) to become frantic about.
Which of the following statements is true of Jupiter's interior?
A) High pressure creates a sudden boundary between liquid and gas. B) It is four times colder than the Sun's surface. C) The rocky core at Jupiter's center contains light-weight elements. D) It is composed of a material that is a very good conductor of electricity.