The idea for the medical model began when Philippe Pinel discarded the idea that . A. mental illness was a sickness of the mind B. patients should be treated with kindness C. mental illness was caused by physiological damage D. mental illness was caused by demon or spirit possession

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)