The spectrum of the cosmic microwave background peaks at a wavelength of about 1 mm, and the universe has a temperature of about 3 K. If the spectrum instead peaked at a wavelength of 10 millimeters, what would its temperature be?
A) the same temperature of about 3 K
B) less than 3 K
C) more than 3 K
B) less than 3 K
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Unpolarized light is passed through polarizer 1 . The light then goes though polarizer 2 with its plane of polarization at 30.0° to that of polarizer 1 . Polarizer 3 is placed after polarizer 2 . Polarizer 3 has its plane of polarization at 30.0° to the plane of polarization of polarizer 2 and at 60.0° to that of polarizer 1 . What fraction of the intensity of the original light gets though
the last polarizer? a. 0.707 c. 0.281 b. 0.125 d. 0.553
Momentum: A firecracker breaks up into two pieces, one of which has a mass of 200 g and flies off along the +x-axis with a speed of 82.0 m/s. The second piece has a mass of 300 g and flies off along the +y-axis with a speed of 45.0 m/s. What is the total momentum of the two pieces?
A. 361 kg ? m/s at 56.3° from the +x-axis B. 93.5 kg ? m/s at 28.8° from the +x-axis C. 21.2 kg ? m/s at 39.5° from the +x-axis D. 361 kg ? m/s at 0.983° from the +x-axis E. 21.2 kg ? m/s at 56.3° from the +x-axis
Which of the following types of radiation has the greatest ability to penetrate matter?
a. Gamma rays b. Beta particles c. Alpha particles d. Protons
In general, Population I stars are ________ and Population II stars are ________.
A. red; blue B. dwarfs; massive C. blue; red D. massive; dwarfs