The main form of radiation that our bodies emit is
a. ultraviolet.
b. infrared.
c. x-ray.
d. microwave.
e. blackbody.
b
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As measured in Earth's rest frame, a spaceship traveling at takes to travel between planets. How long does the trip take as measured by someone on the spaceship?
A) 2.98 y B) 7.28 y C) 42.1 y D) 30.7 y
Two unknown resistors are connected together. When they are connected in series their equivalent resistance is 15 ?. When they are connected in parallel, their equivalent resistance is 3.3 ?. What are the resistances of these resistors?
What will be an ideal response?
For which of the following reasons is production of ethanol unwise?
a. Pollutants aren't significantly reduced. b. It takes twice as much fossil-fuel energy to produce ethanol than the ethanol that is produced supplies. c. It can drive costs of corn higher. d. All of the above.
Above about 100 km, the high-energy portion of the Sun's radiation spectrum breaks down molecules into atoms. What is this part of Earth's atmosphere called?
A) the troposphere B) the stratosphere C) the mesosphere D) the ionosphere E) the magnetosphere