Which of the following statements describes the difference between red and blue light?
A. Red and blue light have different directions of polarization.
B. The wavelength of red light is longer.
C. Blue light has a higher speed of propagation.
D. Red light has a higher intensity.
Answer: B
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Fog that forms in industrial areas is usually quite thick because the pollution particles provide large numbers of ____ nuclei on which water droplets can form
a. hydrophobic b. giant c. salt crystal d. haze e. hygroscopic
Which of the following countries is the locality of the oldest know intact terrestrial rocks?
a. China b. Australia c. Brazil d. Canada e. Sweden
Volcanoes that present major hazards to people living on the continents are likely at location
A. 1. B. 2. C. 3. D. 5. E. 1, 2, and 5.
Stream gradient is constant along the course of a river
Indicate whether the statement is true or false