What is the name given to the part of electromagnetic spectrum which is used for taking photographs of earth under foggy conditions from great heights ?

Answer

To solve the question regarding the part of the electromagnetic spectrum used for taking photographs of the Earth under foggy conditions from great heights, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Problem**: We need to identify which part of the electromagnetic spectrum is effective for photography under foggy conditions. The key requirement is that the radiation should not be scattered by fog particles.

2. **Characteristics of Electromagnetic Waves**: Different parts of the electromagnetic spectrum have different properties. For instance, visible light can be scattered by fog, which makes it unsuitable for clear photography in such conditions.

3. **Identifying Suitable Wavelengths**: We need to look for electromagnetic waves that can penetrate fog. Infrared radiation is known for its longer wavelengths, which are less affected by scattering.

4. **Wavelength Range of Infrared**: Infrared radiation typically has wavelengths ranging from about 700 nanometers (or 7000 Angstroms) to 1 millimeter. This range allows it to travel through fog without significant scattering.

5. **Conclusion**: Based on the above analysis, the part of the electromagnetic spectrum used for taking photographs of the Earth under foggy conditions from great heights is **Infrared radiation**.

### Final Answer:
The name given to the part of the electromagnetic spectrum used for taking photographs of the Earth under foggy conditions from great heights is **Infrared radiation**.

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