Yes, it is theoretically possible to stand on one side of Australia and wave to someone standing on the other side, but there are some practical considerations to keep in mind. Australia is a vast country, spanning over 2,400 miles (3,800 kilometers) from east to west. The time it takes for light or a visual signal to travel from one side to the other can be significant.
Let's assume you're standing on the eastern coast of Australia, and the person you want to wave to is standing on the western coast. The speed of light is approximately 186,282 miles per second (299,792 kilometers per second), so it would take light around 0.04 seconds to travel across the width of Australia. This means that if you were to wave, the other person would see your wave with a delay of about 0.04 seconds.
However, in practical terms, it would be extremely challenging for the other person to see your wave and respond in real time. The curvature of the Earth would obstruct direct line-of-sight visibility over such a large distance. Additionally, atmospheric conditions, terrain, and other factors could further affect visibility.
To overcome these challenges, you could use technology to transmit your wave. For example, you could use a live video call or a real-time streaming platform to communicate with the other person. With the help of the internet and appropriate devices, you could wave to each other and see the response in real time, despite the physical distance.
In summary, while it's theoretically possible to wave from one side of Australia to the other, practical limitations make it challenging. The use of technology can help overcome these limitations and allow for real-time interaction despite the vast distance.