Visible light consists of electromagnetic waves with wavelengths (in air) in the range 400 - 700 nm. What are the frequencies of visible light?
a. 
b. 
c. 
d. 
d.
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Suppose we imagine the Sun to be about the size of a grapefruit. Which of the following describes the size and distance of Earth on the same scale?
A) Earth is the size of a tip of a ballpoint pen about 1 meter away from the Sun. B) Earth is the size of a golf ball about 1 meter away from the Sun. C) Earth is the size of a tip of a ballpoint pen about 15 meters away from the Sun. D) Earth is the size of a golf ball about 15 meters away from the Sun. E) Earth is the size of a marble about 25 miles away from the Sun.
Which of the following wavelength regions cannot be studied with telescopes on the ground?
A) radio waves B) X-rays C) ultraviolet D) both B and C E) both A and C
A charge Q is uniformly spread over one surface of a very large nonconducting square elastic sheet having sides of length d
At a point P that is 1.25 cm outside the sheet, the magnitude of the electric field due to the sheet is E. If the sheet is now stretched so that its sides have length 2d, what is the magnitude of the electric field at P? A) 4E B) 2E C) E D) E/2 E) E/4
Velocity: An airplane travels at 300 mi/h south for 2.00 h and then at 250 mi/h north for 750 miles. What is the average speed for the trip?
A. 260 mi/h B. 270 mi/h C. 275 mi/h D. 280 mi/h