When white light goes into a blue filter, blue light comes out. how did the blue get into the light?

How are calculation for velocity and speed different

Which of the following is not am example of a polymer? protein nylon kevlar concreta

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)