It takes 93.4 J of energy to heat a certain mass of a sample of lead from 22.3°C to 40.4°C. Find the mass of the lead. (Use-Specific heat of lead
=0.129 J/g-K)​

waves moving from a fast medium to a slow medium will experience a reflection as light travels more slowly than red light. total internal reflection occurs when the critical angle is.

luster is not a good characteristic to use by itself because luster is the property of minerals that indicates how much the surface of a mineral reflects light. the luster of a mineral is affected by the brilliance of the light used to observe the mineral surface.