The cosmic background radiation permeating the universe has the spectrum of a 2.7 K thermal radiator. What is the peak wavelength?
What will be an ideal response?
1.1 mm (microwave region)
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Consider the curve f(x) = A cos(2px/l). The wavelength of the wave will be:
a. the distance 0 to A. c. twice the distance x2 to x3. b. twice the distance 0 to A. d. the distance x2 to x3.
Which is the BEST description of what causes tides?
a. Tides are caused by the Moon's gravitational pull on the Earth. b. Tides are caused by earthquakes. c. Tides are caused by the rotation of the Earth. d. Tides are caused by the gravitational pull of the Earth-Moon system. e. Tides are caused by the Earth's gravitational pull on the Moon.
Why are sound waves not polarizable?
a. Because they are not electromagnetic. b. They are not transverse. c. They are not longitudinal. d. But this is readily possible!
Which of the following is not consistent with the major hallmarks of science?
A) A scientific model must make testable predictions. B) Science progresses through the creation and testing of models that explain observation as simply as possible. C) Scientific explanations should be based solely on natural causes. D) Science consists of proven theories that are understood to be true explanations of reality.