The main reason for building large optical telescopes on the Earth's surface is
a. that there is a lot of money in science that needs to get spent.
b. to collect as much light as possible from faint objects.
c. to nullify the blurring effects of the Earth's atmosphere and thus produce higher resolution images.
d. to bring astronomical objects closer to make them brighter.
e. that the warm temperatures of the Earth's surface allow for easier telescope operation.
B
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If the inner accretion disk around a black hole has a temperature of 10^6 K, at what wavelength will it radiate the most energy? (Hint: From Wien's law, ?T =3,000,000 where ? is in nm and T is in K.)
a. 10^6 nm b. 3 nm c. 3 × 10^6 nm d. 1 nm e. 3 × 10^11 nm
The process by which material heated from below rises and cooled material sinks is called ________.
A. conduction B. radiation C. convection D. differentiation E. subduction
You could more easily resolve a close double star with a blue filter than with a red one
Indicate whether the statement is true or false
According to general relativity, a photon emitted by a star
A) loses energy. B) reduces in frequency. C) is red-shifted. D) all of the above E) none of the above