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Two rods of different materials, having ...

Two rods of different materials, having coefficients of linear expansion `a_(1) anda_(2)` and Young’s moduli, `Y_(1) and Y_(2)` , respectively, are fixed between two rigid massive walls. The rods are heated such that they undergo the same increase in temperature. There is no bending of rods. If `alpha_(1)//alpha_(2)=2//3`, then the thermal stresses developed in the two rods are equal, provided `Y_(1)//Y_(2)` is equal to :

A

2:3

B

0.042361111111111

C

`3:2`

D

`4:9 `

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