Why sky wave propagation of electromagnetic waves cannot be used for T.V. transmission ? Suggest two methods for transmission of T.V. programmes.

Explanation

### Step-by-Step Solution:

1. **Understanding Sky Wave Propagation**:
- Sky wave propagation refers to the transmission of electromagnetic waves that are reflected off the ionosphere back to the Earth. This method is commonly used for long-distance communication, especially in the radio frequency range.

2. **Frequency Limitations**:
- The ionosphere can reflect radio waves effectively at frequencies below 40 MHz. However, for television (TV) signals, the frequency range is typically between 100 to 200 MHz. Since these frequencies are higher than 40 MHz, they cannot be reflected by the ionosphere.

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