When heating a solid material, what happens to the atoms within them? Select one: a. They all vibrate with greater frequency. b. They all vibrate with greater amplitude. c. None of these. d. The vibrate with BOTH greater amplitude AND frequency. Solution When we heat any solid, the solid will start vibrating and modes of vibrations will be generated in it. Also according to the theory of solids, solid on increasing temperature start vibrating with greater frequency. Also the atoms present in the solid starting doing simple harmonic motion and they vibrate on their mean position inside any solid There is no role of amplitude . So correct option is (a) .