A mirage occurs when light travels faster
A) near the ground than higher up.
B) in less dense air than more dense air higher up.
C) both of these
D) neither of these
Answer: C
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Which of the following is true of wavelengths of signals sent into space?
A) Wavelengths longer than 100 cm are absorbed in Earth's atmosphere. B) The interval between the 21-cm spectral line of neutral hydrogen and the 18-cm line of OH has very high background interference. C) Wavelengths longer than 100 cm get lost in the background noise of the Milky Way Galaxy. D) The interval between the 21-cm spectral line of neutral hydrogen and the 18-cm line of OH is narrow and can be monitored easily.
The stellar parallax limit for ground-based telescopes is accurate for stars closer than ____
a. 10 parsecs b. 50 parsecs c. 100 parsecs d. 200 parsecs e. 500 parsecs
Imagine another solar system, with a star of the same mass as the Sun. Suppose a planet with a mass twice that of Earth (2MEarth) orbits at a distance of 1 AU from the star. What is the orbital period of this planet?
A) 1 year B) 6 months C) 2 years D) It cannot be determined from the information given.
A mineral's physical properties are dependent on _______.
What will be an ideal response?