When electromagnetic radiation is created it is said to be
A) reflected
B) emitted
C) refracted
D) absorbed
B
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A ruby’s red color results from the substitution of _____________atoms for aluminum atoms in a crystal of Al2O3.
Fill in the blank(s) with the appropriate word(s).
Ultraviolet radiation from a star
a. will not penetrate Earth's atmosphere and reach the ground. b. has a wavelength that is longer than the visible light emitted by the star. c. has a wavelength that is shorter than the X-rays emitted by the star. d. will not penetrate Earth's atmosphere and reach the ground and has a wavelength that is longer than the visible light emitted by the star. e. has a wavelength that is longer than the visible light emitted by the star and has a wavelength that is shorter than the X-rays emitted by the star.
Two weights are connected by a massless wire and pulled upward with a constant speed of 1.50 m/s by a vertical pull P. The tension in the wire is T (see figure). P is closest to
A) 25 N. B) 125 N. C) 187.5 N. D) 245 N. E) 1225 N.
A 2.31-kg rope is stretched between supports that are 10.4 m apart, and has a tension in it of 49.2 N. If one end of the rope is slightly tweaked, how long will it take for the resulting disturbance to reach the other end?
A) 0.720 s B) 0.699 s C) 0.615 s D) 0.664 s