You just saw a magazine ad that shows several people having fun at a football game. they are all wearing a specific shoe brand. the words on the ad say "you can run with the fast crowd." what technique has the advertising company used to persuade you to own their shoe

The atoms in a nickel crystal vibrate as harmonic oscillators with an angular frequency of 2.3 × 1013 rad/s. the mass of a nickel atom is 9.75 × 10-26 kg. what is the difference in energy between adjacent vibrational energy levels of nickel? (h = 6.626 × 10-34 j • s, , 1 ev = 1.60 × 10-19 j)