Figure 21.6 corresponds to the reconstruction of a doubly exposed hologram, the objects corresponding to the unstrained and strained positions of an aluminum bar of width 4 cm, thickness 0.2 cm and length 12 cm. If the strained position corresponds to a load of 1 gm force applied at the end of the bar, calculate the Young’s modulus of aluminum. Assume θ1 ≈ θ2 ≈ 0 and λ = 6328 Å. [Hint: N represents the number of fringes produced over the length of the cantilever.]
[Ans: 0.7 × 10 11 N/m2]
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