The vertical displacement y(x,t) of a horizontal string aligned along the x-axis is given by the equation y(x,t) = (6.00 mm) cos[(3.25 m-1)x - (7.22 s-1)t]. What are the (a) wavelength and (b) period of this wave?
What will be an ideal response?
(a) 1.93 m (b) 0.870 s
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A straight wire (length = 8.0 m) is bent to form a square. If the wire carries a current of 20 A, what is the magnitude of the magnetic field at the center of the square?
a. 17 ?T b. 14 ?T c. 11 ?T d. 20 ?T e. 36 ?T
________ is the concept that the universe looks the same in all directions
Fill in the blank(s) with correct word
The reason the position of a particle cannot be specified with infinite precision is the
A) coherence principle. B) exclusion principle. C) uncertainty principle. D) photoelectric effect. E) principle of relativity.
Which of the following statements is false? a. The angle ? in Snell's law is measured between the ray and a line perpendicular to the surface. b. Photons of blue light have a higher energy than photons of red light
c. A photon's energy depends on its brightness. d. The ratio v/? of a photon's speed to its wavelength has the same value for any index of refraction n.