Helium fusion within a star begins
A) after all the hydrogen within the star has been depleted.
B) when all carbon has been depleted.
C) because of the force of gravity.
D) with the expulsion of practically all hydrogen.
Answer: C
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Light in air of wavelength 500 nm illuminates a soap film that has an index of refraction of 1.3 and air on both sides
What is the minimum thickness of this film that will produce cancellation in the reflected light when the light is incident normally on the film?
A parallel plate capacitor is charged to voltage V and then disconnected from the battery. Leopold says that the voltage will decrease if the plates are pulled apart. Gerhardt says that the voltage will remain the same. Which one, if either, is correct, and why?
a. Gerhardt, because the maximum voltage is determined by the battery. b. Gerhardt, because the charge per unit area on the plates does not change. c. Leopold, because charge is transferred from one plate to the other when the plates are separated. d. Leopold, because the force each plate exerts on the other decreases when the plates are pulled apart. e. Neither, because the voltage increases when the plates are pulled apart.
The air in your classroom has
A) mass. B) weight. C) energy. D) all of the above E) none of the above
One line of evidence supporting the big bang theory is
A) the nuclear fission products observed in our galaxy are just what is predicted by the big bang theory. B) the density of galaxies observed in the universe is just what is predicted by the big bang theory. C) the observed abundance of very heavy elements in our galaxy is just what is predicted by the big bang theory. D) neutron stars have just the masses and frequencies of rotation that are predicted by the big bang theory. E) the observed abundance of very light elements in our galaxy is just what is predicted by the big bang theory.