Find the image position for a picture placed 3.0 cm outside the focal point of a converging lens with a 4.0 cm focal length. a. 6.2 cm c. 2.8 cm b. 9.3 cm d. 11.0 cm

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)