For LEDs to emit light in visible region of electromagnetic light it should have energy band gap in the range of

Options

A. 0.7 eV to 0.4 eV
B. 0.5 eV to 0.8 eV
C. 0.9 eV to 1.6 eV
D. 1.7 eV and 3.0 eV

Explanation

To determine the energy band gap required for LEDs to emit light in the visible region of the electromagnetic spectrum (400 nm to 700 nm), we can follow these steps:

### Step-by-Step Solution:

1. **Understand the wavelength range for visible light**:
- The visible light spectrum ranges from approximately 400 nm (violet) to 700 nm (red).

2. **Use the energy-wavelength relationship**:
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