If the temperature increases, the modulus of elasticity

Options

A. decreases
B. increases
C. remains constant
D. becomes zero

Explanation

To solve the question "If the temperature increases, the modulus of elasticity...", we will analyze the relationship between temperature and the modulus of elasticity step by step.

### Step-by-Step Solution:

1. **Understanding Modulus of Elasticity**:
- The modulus of elasticity (E) is a measure of a material's ability to deform elastically (i.e., non-permanently) when a force is applied. It is defined as the ratio of stress (force per unit area) to strain (deformation in the material).

2. **Effect of Temperature on Material Structure**:
- When the temperature of a material increases, the kinetic energy of its particles also increases. This leads to greater movement and vibration of the particles.

3. **Intermolecular Forces**:
- As the temperature rises, the distance between the molecules or particles in the material tends to increase. This is due to the increased thermal energy causing the particles to move apart.

4. **Decrease in Intermolecular Forces**:
- With the increase in distance between the particles, the intermolecular forces (which hold the particles together) become weaker. This weakening of intermolecular forces means that the material can deform more easily under stress.

5. **Conclusion on Modulus of Elasticity**:
- Since the modulus of elasticity is related to the ability of a material to resist deformation, a decrease in intermolecular forces leads to a decrease in the modulus of elasticity. Therefore, as the temperature increases, the modulus of elasticity decreases.

### Final Answer:
If the temperature increases, the modulus of elasticity decreases.

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