A uniform film of oil (n = 1.31) is floating on water. When sunlight in air is incident normally on the film, an observer finds that the reflected light has a brightness maximum at ? = 450 nm and a brightness minimum at ? = 600 nm. What is the thickness of the oil film?
343.5 nm
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The disk of our galaxy consists of
a. the nine known planets. b. only stars. c. stars, dust, and gas. d. quasars. e. only black holes.
Astronaut Jill leaves Earth in a spaceship and is now traveling at a speed of 0.280c relative to an observer on Earth. When Jill left Earth, the spaceship was equipped with all kinds of scientific instruments, including a meter stick
Now that Jill is underway, how long does she measure the meter stick to be? A) 1.00 m B) 0.960 m C) 1.04 m D) 0.280 m E) 1.28 m
When the electrons in an atom are in their lowest possible energy levels, the atom is said to be in its ____________________ state
Fill in the blank(s) with correct word
The site from which an airplane takes off is the origin. The x axis points east; the y axis points straight up. The position and velocity vectors of the plane at a later time are given by
?
and 
m/s.
?
The plane is most likely
A. just touching down. B. in level flight in the air. C. ascending. D. descending. E. taking off.