Refracting Telescope: A student wishing to build a telescope has available an eyepiece of focal length -5.0 cm. What focal length objective is needed to obtain a magnification of 10?
Fill in the blank(s) with the appropriate word(s).
50 cm
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The recombination era of the big bang was very important in several ways. Explain what happened during this time and what observable effects of the era existed
What will be an ideal response?
Wave Characteristics: A cordless phone operates at 900 MHz. What is the wavelength of the electromagnetic wave used by this phone? (c = 3.0 × 108 m/s)
Fill in the blank(s) with the appropriate word(s).
Hubble Space Telescope photos have shown us:
A) Uranus weather has produced more prominent patterns as equinox approaches. B) the Great Dark Spot of Neptune vanished in 1995. C) the rings of Uranus show up better in infrared than in visible light. D) Neptune still has more activity than Uranus, despite its distance from the Sun. E) All of the above are correct.
What use are 21 cm radio waves to Galactic astronomers?
A) They cut through the dusty cocoons to let us watch star birth. B) We can reflect them off the core of the Galaxy. C) Their Doppler shifts let us map the motions and locations of gas in the spiral arms. D) They bounce off stars like our Sun to let us precisely measure their distances. E) They pick up the cool, dark matter much better than can optical telescopes.