1⃣ when ball crush to object,
if object doesn't moves,
perfect reflection happens to ball
( movement energy of ball, preserves )
2⃣ when ball crush to object,
if object doesn't moves,
perfect reflection happens to ball
( movement energy of ball, not preserves )
3⃣ lets think
ball = electron,
object = metal
when electron crush in metal, = pattern 1⃣
if metal doesn't moves,
perfect reflection happens to electron
perfect reflection of electron = no residence of metal
