In air a light source emits a wavelength of 630 nm. Under water the wavelength of this light will be
a. 630 nm
b. less than 630 nm
c. more than 630 nm
d. unpredictable
B
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The longest diameter of the Milky Way is about how many light-years?
a. 10 b. 10,000 c. 100 d. 100,000
Suppose that a car traveling to the East (+x direction) begins to slow down as it approaches a traffic light. Make a statement concerning its acceleration
A) The car is decelerating, and its acceleration is positive. B) The car is decelerating, and its acceleration is negative. C) The acceleration is zero. D) The car is accelerating, and its acceleration is positive. E) The car is accelerating, and its acceleration is negative.
Reflecting telescopes suffer from chromatic aberration because the light must pass through the glass
a. True b. False Indicate whether the statement is true or false
Two infinite, uniformly charged, flat surfaces are mutually perpendicular. One of the sheets has a charge density of +60 pC/m2, and the other carries a charge density of ?80 pC/m2 . What is the magnitude of the electric field at any point not on either surface?
a. 1.1 N/C b. 5.6 N/C c. 7.9 N/C d. 3.8 N/C e. 4.0 N/C