A telescope that suffers from chromatic aberration and has a low light gathering power is most likely
a. a small diameter reflecting telescope.
b. a small diameter refracting telescope.
c. a large diameter refracting telescope.
d. a large diameter reflecting telescope.
e. an infrared telescope.
B
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I observe a galaxy that is 100 million light years away. Which of the following do I see?
A) the light from the galaxy as it is today, and it is redshifted B) the light from the galaxy as it was 100 million years ago, and it is redshifted C) the light from the galaxy as it is today, and it is blueshifted D) the light from the galaxy as it was 100 million years ago, and it is blueshifted E) Nothing: the galaxy lies beyond the cosmological horizon.
An 18-mm wide diffraction grating has rulings of 880 lines per mm. Monochromatic light of 590 nm wavelength is incident normally on the grating
What is the largest angle, measured from the central bright spot, at which an intensity maximum is formed? A) 23° B) 25° C) 31° D) 29° E) 27°
Which statement about the behavior of Universe geometries is correct? a. Closed and open universes expand forever
b. Closed universes expand and then contract. c. Only flat universes expand forever. d. Flat and open universes expand and then contract. e. Only flat universes expand and then contract.
Suppose that we have a sample of 20 atoms of radioactive potassium which decays by half every 1.3 billion years into calcium and argon at ratios of 9:1, respectively. How many atoms of calcium do you expect to find in this sample after 1.3 billion years?
A. 9 B. 18 C. 1 D. 2