18. what happens if you cut a bar magnet in half?
a. you get two north pole magnets
b. you get a north pole magnet and a south pole magnet
c. you get two south pole magnets
d. you get two smaller magnets, each with a north and south pole

Which term best describes the phrase “something that happens”?

When a neutrally charged atom loses an electron to another atom, the result is the creation of a. two charged atoms. b. two negatively charged atoms. c. two positively charged atoms. d. two neutrally charged atoms.

Your target variable is δf, the magnitude of the difference in frequency between the waves emitted from the sonar device and the waves received by the device after reflecting off the whale. write an expression for δf in terms of the relevant frequencies using the subscript notation introduced above.