The speed of light in a certain type of glass is 30% slower than the speed of light in air. What is the index of refraction for that type of plastic?
A. 1.43
B. 1.67
C. 1.33
D. 1.5
Answer: A
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The structure of black hole jets is believed to be controlled by magnetism
a. True b. False Indicate whether the statement is true or false
A +2.0-nC point charge is placed at one corner of a square (1.5 m on a side), and a -3.0-nC charge is placed on a corner diagonally away from the first charge. What is the magnitude of the electric field at either of the two unoccupied corners?
a. 20 N/C b. 14 N/C c. 4.0 N/C d. 12 N/C e. 8.0 N/C
The Sun's composition (by mass) is approximately
A) 100 percent hydrogen and helium. B) 50 percent hydrogen, 25 percent helium, 25 percent other elements. C) 70 percent helium, 28 percent hydrogen, 2 percent other elements. D) 70 percent hydrogen, 28 percent helium, 2 percent other elements. E) 98 percent hydrogen, 2 percent helium, and other elements.
Why does detection of abundant free oxygen in an atmosphere suggest life is present? Does its absence prove life could not be present?
What will be an ideal response?