Several surprising discoveries were made as astronomers began detecting exoplanets. Which statement is correct?
A. There are terrestrial planets larger than Earth.
B. Gas giants can orbit extremely close to their star.
C. Some exoplanets have extremely elliptical orbits.
D. All of these choices are correct.
E. None of these choices are correct.
Answer: D
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____________________ is responsible for absorbing ultraviolet radiation in Earth's upper atmosphere
Fill in the blank(s) with correct word
_________ is absorbed by water in Earth's atmosphere and requires that telescopes for observing at these wavelengths be placed on mountain tops or in space
a. Infrared radiation b. Ultraviolet radiation c. Radio wave radiation d. X-ray radiation e. Visible light
Resistance and Resistivity: The resistivity of gold is 2.44 × 10-8 ? ? m at a temperature of 20°C. A gold wire that is 0.50 mm in diameter and 44 cm long carries a current of 380 mA. How many electrons each second pass a given cross section of the wire at 20°C? (e = 1.60 × 10-19 C)
A. 2.4 × 1018 B. 2.4 × 1017 C. 1.2 × 1022 D. 2.8 × 1014 E. 6.3 × 1015
How many turns should a 10-cm long solenoid have if it is to generate a 1.5 × 10-3 T magnetic field on 1.0 A of current?
A) 12 B) 15 C) 120 D) 1200 E) 3200