Compton Scattering: An 18.0 pm wavelength photon is scattered by a stationary electron through an angle of 120°. What is the wavelength of the scattered photon? (melectron = 9.11 × 10-31 kg, c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s)
A. 19.2 pm
B. 20.4 pm
C. 21.6 pm
D. 22.9 pm
E. 24.1 pm
Answer: C
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A) 2.73 K B) 5, 800 K C) 16, 000 K D) 1032 K E) We have no theory capable to addressing this question.
Cold-dark-matter models predict:
A) large-scale filaments containing both normal matter and dark matter. B) no structure on a smaller scale than superclusters. C) the universe is less than 10 billion years old. D) dense regions of the early universe that led to galaxies formed after decoupling. E) that dark matter is the largest component of the universe's density.
Holograms employ the principle of
A) diffraction. B) interference. C) both of these D) neither of these
A certain source of sound waves radiates uniformly in all directions. At a distance of 20 m from the source the intensity level is 51 db
What is the total acoustic power output of the source, in watts? (Note: The reference intensity I0 is 1.0 × 10-12 W/m2.)