Concept of phonon part -1 || by Gurpreet singh

[@physicsstudyandnotes4999]

Amazing cls sir 🤘🤘🤘

[@poojamot9316]

Thanku sir

[@physicspgpsclasses2663]

thx

[@M_M_M_007]

Sir ye topic konsi unit ka h

[@physicspgpsclasses2663]

unit- 4 in bsc third yr