Calculating Length, Diameter and Volume Change of a Laser Rod

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SUMMARY

The discussion focuses on calculating the thermal expansion of a laser rod made of glass, specifically its length, diameter, and volume changes due to a temperature increase of 78.5°C. The initial dimensions of the rod are 18.7 cm in length and 1.33 cm in diameter. The calculated increase in length is 0.0132 cm, and the increase in diameter is 0.0009396 cm. The volume change can be determined using the formula for volume expansion, which is referenced in the discussion.

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Homework Statement


The active element of a certain laser is an ordinary glass rod 18.7 cm long and 1.33 cm in diameter. If the temperature of the rod increases by 78.5oC, calculate its increase in length. Calculate its increase in diameter. Calculate its increase in volume.


Homework Equations



change in L=Li*alfa*change in T


The Attempt at a Solution


Length increased by 0.0132 cm
Diameter increased by 9.396E-4cm
I don't know how to get the increase in volume. Could someone please help? Thanks!
 
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