A plastic cube is immersed in water having an index of refraction of 1.33. A laser beam in the plastic strikes the interface at an angle of 14.5° with the normal in the plastic. In the water, this beam makes an angle of 21.8° with the normal
What is the speed of light in the plastic cube? (c = 3.0 × 108 m/s)
1.52 × 108 m/s
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Compared to Uranus, Neptune has a smaller diameter and more mass. What can we conclude from this comparison?
A. Uranus spins faster and therefore has a larger diameter. B. Neptune has higher average density than Uranus. C. Uranus has higher average density than Neptune. D. The statement of the question is incorrect. Uranus is larger and has more mass than Neptune.
The escape velocity needed for an atom in the atmosphere of a planet to escape the gravitational pull of the planet is smaller if:
a) the radius of the planet is smaller b) the planet is farther from the Sun c) the mass of the atom is larger d) the temperature of the gas in the atmosphere is lower e) the mass of the planet is smaller
Combining two sounds of equal intensity will give a sound level 3 dB higher than the sound level due to just one of them
a. True b. False Indicate whether the statement is true or false
Astronomers can measure a star's mass in only certain cases. Which one of the following cases might allow astronomers to measure a star's mass?
A) The star is a member of a binary star system. B) The star is of spectral type G. C) The star is of spectral type A. D) We know the star's luminosity and distance.