Longitudinal strain Is calculated using the formula:

$O r i g i n a l L e n g t h \times C h a n g e I n L e n g t h .$

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$O r i g i n a l L e n g t h - C h a n g e I n L e n g t h .$

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$O r i g i n a l L e n g t h / C h a n g e I n L e n g t h .$

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$C h a n g e I n L e n g t h / O r i g i n a l L e n g t h .$

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Solution

The correct option is D
$C h a n g e I n L e n g t h / O r i g i n a l L e n g t h .$

Elastic Properties of Solids
The elastic properties of solid are related to elasticity which is defined as the property by virtue of which the bodies regain their original shape and size when the deforming forces are removed.
This is a common property of all classes of solids.
In technology, it would tell us about the elastic strength of the materials.
In fundamental research, it provides into the nature of the binding forces in solids.
The relevant elastic constants are also interrelated to thermal properties like Debye temperature.
Strain
Strain is a measure of the amount of deformation undergone by a body.
Strain can be defined as the ratio of the change in length of a body in the direction of the force applied, to its initial length.
Strain is a unitless quantity.
If the original length of the body is $L$ , the strain can be given as,
$S = \frac{∆ L}{L}$
Hence, the correct answer is option (D).

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