Intensity of Sound: You double your distance from a sound source that is radiating equally in all directions. What happens to the intensity level of the sound? It drops by
A. 2 dB.
B. 3 dB.
C. 6 dB.
D. 8 dB.
Answer: C
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A particle (mass = 5.0 g, charge = 40 mC) moves in a region of space where the electric field is uniform and is given by Ex = ?5.5 N/C, Ey = Ez = 0. If the position and velocity of the particle at t = 0 are given by x = y = z = 0 and vx = 50 m/s, vy = vz = 0, what is the distance from the origin to the particle at t = 2.0 s?
A. 60 m B. 28 m C. 44 m D. 12 m E. 88 m
Why does neutron capture work?
A) Neutrons have no repulsive barrier to overcome in combining with positively charged nuclei. B) Neutrinos, because of their low mass and high speed, easily penetrate nuclei. C) Single protons have little repulsion to heavy nuclei and easily fuse with them. D) Photodisintegration makes many alpha particles, available for capture by nuclei. E) Neutronization captures all the protons and electrons.
N rays do not exist
Indicate whether the statement is true or false
The example shown is a(n) ______ website structure.
A. linear/tutorial B. hierarchical C. webbed D. random