What is the minimum thickness of a glycerin film (n = 1.47) on which light of wavelength 450 nm shines that results in constructive interference of the reflected light? Assume the film is surrounded front and back by air
a. 150 nm
c. 204 nm
b. 76.5 nm
d. 102 nm
B
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Significant Figures: Add 1299 g and 45.1 kg and express your answer in milligrams (mg) to the correct number of significant figures.
A. 4.64 × 107 mg B. 4.64 × 104 mg C. 4.64 × 105 mg D. 4.64 × 106 mg
When two galaxies collide, what happens to their stars?
A. About 30% of them collide and become black holes. B. The evolution of all the stars in the larger galaxy is accelerated. C. About 50% of them become binary stars. D. Nothing happens to them, except that their orbits may change.
The choices below each describe the appearance of an H-R diagram for a different star cluster. Which cluster is the youngest?
A) The diagram shows main-sequence stars of every spectral type except O, along with a few giants and supergiants. B) The diagram shows no main-sequence stars at all, but it has numerous supergiants and white dwarfs. C) The diagram shows main-sequence stars of spectral types G, K, and M, along with numerous giants and white dwarfs. D) The diagram shows main-sequence stars of all the spectral types except O and B, along with a few giants and supergiants.
A spaceship captain lands on an unknown planet. Before venturing forth, he needs to find out the acceleration due to gravity on that planet
All he has available to him is some thin light string, a stopwatch, and a small 2.75-kg metal ball (it was a rough landing). So he lets the ball swing from a 1.5-m length of the string, starting at rest, and measures that it takes 1.9 s for it to swing from the place where he released it to the place where it first stops as it reverses direction. What is the acceleration due to gravity on this planet?