Three waves A,B and C of frequencies 1500 KHz. 6MHz and 50 MHz respectively are to be transmitted from one place to another. Which of the following is the most appropriate mode of communciation?

Options

A. A is transmitted via space wave while B and C are transmitted via sky wave
B. A is transmitted via ground wave, B via sky wave and C via space wave
C. B and C tranmitted via ground wave while A is trasnmitted via sky wave
D. B is transmitted via ground wave while A and C are transmitted via space wave

Explanation

To determine the most appropriate mode of communication for the given frequencies of waves A, B, and C, we will analyze each frequency and match it with the corresponding mode of communication.

### Step-by-Step Solution:

1. **Identify the Frequencies:**
- Wave A: 1500 kHz
- Wave B: 6 MHz
- Wave C: 50 MHz

2. **Understand the Modes of Communication:**
- **Ground Wave Propagation:** Typically operates in the frequency range of 2 MHz to a few MHz. It is suitable for short-range communication.
- **Sky Wave Propagation:** Operates in the frequency range of 30 MHz to 40 MHz. This mode reflects signals off the ionosphere, allowing for long-distance communication.
- **Space Wave Propagation:** Operates at frequencies greater than 40 MHz. This mode is used for line-of-sight communication, often involving satellite communication.

3. **Classify Each Wave:**
- **Wave A (1500 kHz):** This frequency is below 2 MHz, which is not suitable for ground wave propagation. Therefore, it does not fit into any of the defined categories.
- **Wave B (6 MHz):** This frequency is also below the sky wave propagation range (30 MHz to 40 MHz) and thus does not fit here either.
- **Wave C (50 MHz):** This frequency is above 40 MHz, making it suitable for space wave propagation.

4. **Conclusion:**
- Based on the classifications:
- Wave A does not fit into any mode of communication.
- Wave B does not fit into any mode of communication.
- Wave C is suitable for space wave propagation.
- Therefore, the most appropriate mode of communication for the frequencies given is **Space Wave Propagation** for Wave C (50 MHz).

### Final Answer:
The most appropriate mode of communication for the given frequencies is **Space Wave Propagation** (for Wave C).