A nearsighted person has a far point of 2.0 m. Neglecting eye-lens distance, what power lens would allow good distant vision?
1.2.0 diopters
2.0.50 diopter
3.–2.0 diopters
4.–0.50 diopter
4
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Which of the following statements is true of coronal holes?
A) Open magnetic fields allow ionized gas to flow away as the solar wind. B) Reconnection events prevent the release of ionized gases outward from the corona. C) Discharge of solar materials is prevented because the region is extremely thick. D) Magnetic field loops back into the Sun to trap the solar wind.
If observations had shown that the cosmic microwave background was perfectly smooth (rather than having slight variations in temperature), then we would have no way to account for
A) the relationship between the strong and the weak force. B) the fact that our universe is expanding. C) how galaxies came to exist. D) the existence of helium in the universe.
A light ray in water passes into air. The angle of incidence in the water is 40°. What is the angle of refraction in air if the index of refraction of water is 1.33?
A) 59° B) 0.59° C) 40° D) 1.33° E) 29°
The lowest tone to resonate in an open pipe of length L is 200 Hz. Which one of the following frequencies will not resonate in the same pipe?
A) 400 Hz B) 600 Hz C) 800 Hz D) 900 Hz E) 1000 Hz