What important role does the ozone layer play in Earth's atmosphere?
a. The ozone layer absorbs ultraviolet photons
b. The ozone layer traps in infared radiation.
c. The ozone layer produces water vapor.
d. The ozone layer traps in UV radiation.
e. The ozone layer produces the oxygen needed for life.
a
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Compared to an identical ice cube exposed to air at room temperature, an ice cube wrapped in a wool blanket remain frozen for
1.less time. 2.the same length of time. 3.a longer time.
A high-voltage transmission line of diameter 2 cm and length 150 km carries a steady current of 1 000 A. If the conductor is copper with a free charge density of 8 × 10^28 electrons/m3, how long does it take one electron to travel the full length of the cable? (e = 1.6 × 10^?19 C)
a. 6.0 × 10^2 s b. 6.0 × 10^4 s c. 6.0 × 10^6 s d. 6.0 × 10^8 s e. 6.0 × 10^–10 s
If it is given that 546 K equals 273°C, then it follows that 423 K equals:
a. 127°C. c. 473°C. b. 150°C. d. 1200°C.
Resistance and Resistivity: When a potential difference is applied across a piece of wire made of metal A, a 5.0-mA current flows. If the metal-A wire is replaced with a wire made of metal B having twice the diameter of the metal-A wire, how much current will flow through the metal-B wire? The lengths of both wires are the same, and the voltage difference remains unchanged. The resistivity of metal A is 1.68 × 10-8 ? ? m, and the resistivity of metal B is 1.59 × 10-8 ? ? m.
A. 21 mA B. 19 mA C. 11 mA D. 5.3 mA