Select all of the answers that apply (< take notice to this part of my question)instruments used to monitor a volcano include - seismographs - richter scale - tiltmeters - correlation spectrometers - mercalli intensity scale

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Need asap ‼️ 20 pts which gravitational force field diagram is drawn correctly? (answers in pictures below)

An alpha particle with kinetic energy 12.5 mev makes a collision with lead nucleus, but it is not "aimed" at the center of the lead nucleus, and has an initial nonzero angular momentum (with respect to the stationary lead nucleus) of magnitude l = p0 b, where p0 is the magnitude of the initial momentum of the alpha particle and b=1.40×10−12 m. (assume that the lead nucleus remains stationary and that it may be treated as a point charge. the atomic number of lead is 82. the alpha particle is a helium nucleus, with atomic number 2.) what is the distance of closest approach?