Two slits are illuminated with red light (l = 650 nm). The slits are 0.25 mm apart and the distance to the screen is 1.25 m. What fraction of the maximum intensity on the screen is the intensity measured at a distance 3.0 mm from the central maximum?
a. 0.94
b. 0.92
c. 0.96
d. 0.98
e. 0.99
A
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Which of the following might explain the lack of "water worlds" (planets made mostly of water or other hydrogen compounds) in our own solar system?
A) In our solar system, the solar wind did not clear out gas until relatively late. B) There was not enough water in our solar system. C) Small worlds in our solar system formed only close to the Sun, where it was too hot for hydrogen compounds to condense. D) Water worlds can form only in systems in which all planets have highly elliptical (eccentric) orbits. Fill in the blank(s) with the appropriate word(s).
Suppose we use a baseball to represent Earth. On this scale, the other terrestrial worlds (Mercury, Venus, the Moon, and Mars) would range in size approximately from that of
A) a dust speck to a golf ball. B) a golf ball to a baseball. C) a dust speck to a basketball. D) a golf ball to a beach ball.
A scientist tries to determine why a particular car is getting a much lower gas mileage than claimed by the manufacturer by systematically designing experiments to test possible causes for the problem. This is an example of
A) discovery science B) nonscience C) hypothesis-driven science D) pseudoscience
Water is sent from a fire hose at 40 m/s at an angle of 30° above the horizontal. What is the maximum height reached by the water?
a. 7.5 m c. 15 m b. 11 m d. 20 m