Electromagnetic radiation (light) comprises of waves. More than a century ago, scientists supposed that the light, like other waves, needed a medium (termed the ether) to support its transmission. Glass, having a typical mass density of 2650 kg/m3, as well supports the transmission of light. Determine what would the elastic modulus of glass have to be to support the transmission of light waves at a speed of v = 2.21 x 108 m/s? (For comparison: the real elastic modulus of window glass is 5 x 1010 N/m2.)