7. Physical properties Table of contents 7.1 Crystals 7.2 X-rays 7.1 Crystals Questions & answers Which are the properties that vary according to directions in crystalline solids? Why do crystals with centrosymmetric point groups not show piezoelectricity? How can I check if my quartz crystal rosery is real or not? Why is crystal a preferred clock source? What determines the speed of sound in a metal crystal? What are the differences between bulk crystallography and surface crystallography? What is the effect of temperature on SC, BCC and FCC crystal structures? 7.2 X-rays Questions & answers Is x-ray a light? Can X-rays be produced from gases? How can x-rays be obtained from a cathode? Can airport x-rays detect small traces of weed? What are example of soft and hard x-ray?
