What is the SI unit of modulus of elasticity of a substance?
Correct answer: C. Nm^-1
- A. Nm^-2
- B. Jm^-2
- C. Nm^-1
- D. Being a number, it has no unit
Explanation
The modulus of elasticity, also known as Young's modulus, measures the stiffness of a material. It is defined as the ratio of stress to strain within the elastic limit of the material. The SI unit of modulus of elasticity is Newton per square meter (Nm^-2) or Pascal (Pa). Therefore, option c) Nm^-1 is the correct SI unit for modulus of elasticity.
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About Physics of Solids
Solids are compared through crystal structure, amorphous arrangement, elasticity, plastic deformation, stress, strain and Young’s modulus. Electrical behavior depends on available charge carriers and band structure, so conductors, insulators and semiconductors must be distinguished from mechanical properties such as strength, stiffness and brittleness.
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