The experiment, which gave the first evidence for the existence of the atomic nucleus, involved which of the following?
a. x-ray scattering
b. radioactive dating
c. cosmic ray detection
d. alpha scattering
d
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Two in-phase loudspeakers that emit sound with the same frequency are placed along a wall and are separated by a distance of 8.00 m
A person is standing 12.0 m away from the wall, equidistant from the loudspeakers. When the person moves 3.00 m parallel to the wall, she experiences destructive interference for the second time. What is the frequency of the sound? The speed of sound in air is 343 m/s. A) 562 Hz B) 278 Hz C) 452 Hz D) 694 Hz E) 422 Hz
Discuss two ways of detecting dark matter in distant galaxies and clusters
What will be an ideal response?
As a projectile moves along its parabolic trajectory, which of the following remain constant (ignoring air resistance, and defining the z axis as pointing upward)?
A. Its speed B. Its velocity C. Its x-velocity and y-velocity D. Its z-velocity E. Its acceleration F. Its x-velocity, y-velocity, and acceleration T. Some other combination of the given quantities
About how many potentially hazardous asteroids pass within 0.05 AU of the Earth per decade in modern times?
A) None B) 10-20 C) 200-300 D) 5000-1000 E) A completely unknown quantity; it could easily be anywhere from just a few to millions.