Electromagnetic radiation (light) consists of waves. More than a century ago, scientists thought that light, like other waves, required a medium (called theether) to support its transmission. Glass, having a typical mass density of ρ = 2500 kg/m3, also supports the transmission of light. What would the elastic modulus of glass have to be to support the transmission of light waves at a speed of v = 2.0 • 108 m/s? Compare this to the actual elastic modulus of window glass, which is 5 •1010 N/m2.
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