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

Physics & Space Science

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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

Physics & Space Science

Discuss two ways of detecting dark matter in distant galaxies and clusters

What will be an ideal response?

Physics & Space Science

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

Physics & Space Science

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.

Physics & Space Science