Thin Films: A soap bubble, when illuminated at normal incidence with light of 463 nm, appears to be especially reflective. If the index of refraction of the film is 1.35, what is the minimum thickness the soap film can be if it is surrounded by air?
Fill in the blank(s) with the appropriate word(s).
85.7 nm
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The force of gravity is the only one of the four forces felt on very large size scales. Which of the following best explains why the other forces don't play a major role on large scales?
A) The other three forces are all very short in range, and cannot be felt over large distances. B) The strong and weak forces act only on very small scales, and large objects tend to be electrically neutral and therefore don't feel an electromagnetic force. C) Gravity is by far the strongest force, so it simply dominates on large size scales. D) Effects of the strong and weak forces tend to cancel out effects of the electromagnetic force on large scales.
Two identical spheres each carry a charge of ?82.0 µC. The spheres are separated by a distance of 2.00 m. What is the electric force between the spheres? (ke = 8.99 × 10^9 N·m2/C2)
a. 0.184 N (repulsive) b. 15.1 N (repulsive) c. 30.2 N (attractive) d. 1.47 N (attractive) e. 37.8 N (attractive)
Weather occurs in the
a. stratosphere. b. troposphere. c. mesosphere. d. thermosphere.
Complete the reaction: e + p ? _______________; the reaction applies to ________________
a. n, white dwarfs b. ?, neutron stars c. n + ?, white dwarfs d. n + ?, neutron stars