Statement1: LED is used in display units because it emits light when current passes through it.
Statement2: In LED, electrons comes from conduction band to valence band when it emits energy.

Answer

To analyze the statements regarding LEDs, we can break down the information as follows:

### Step 1: Understand Statement 1
**Statement 1:** "LED is used in display units because it emits light when current passes through it."

- **Explanation:** Light Emitting Diodes (LEDs) are semiconductor devices that emit light when an electric current flows through them. This occurs due to the recombination of electrons and holes within the semiconductor material, which releases energy in the form of photons (light).

### Step 2: Understand Statement 2
**Statement 2:** "In LED, electrons come from conduction band to valence band when it emits energy."

- **Explanation:** In a semiconductor, the conduction band is the range of electron energies higher than the energy needed to free electrons from their atomic bonds, while the valence band is the range of energies where electrons are bound to atoms. When an electron from the conduction band falls to the valence band, it recombines with a hole, and energy is released. This energy is emitted as light.

### Step 3: Evaluate the Truth of Both Statements
- Both statements are true. Statement 1 accurately describes the function of an LED in display units, and Statement 2 correctly explains the mechanism of light emission in LEDs.

### Step 4: Determine the Relationship Between the Statements
- Statement 2 provides a correct explanation for Statement 1. The emission of light (Statement 1) is a direct result of the process described in Statement 2, where electrons transition from the conduction band to the valence band.

### Conclusion
- Both statements are true, and Statement 2 is indeed a correct explanation for Statement 1.

### Final Answer:
- **Both Statement 1 and Statement 2 are true, and Statement 2 is a correct explanation for Statement 1.**

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