hree light beams encounter a medium. One light ray is reflected, while the other two are absorbed. How can the medium be described?

Transparent
Translucent
Opaque
or Clear

In satellite communication, does the satellite...

Receive radio signals
Prevent radio signals
Send radio signals
or Reduce radio signals

How does radioactivity make it possible to understand how Earth can be so old and still have a hot interior?

Opaque, recieve radio signals

Yes

To describe the medium based on the given scenario in the first question, we need to analyze how light behaves when it encounters the medium. Here's a step-by-step approach to answering this question:

1. Understand the behavior of light: Light can be reflected, absorbed, or transmitted when it encounters a medium.

2. The problem states that three light beams encounter the medium. One light ray is reflected, while the other two are absorbed.

3. Based on this information, we can conclude that the medium is Opaque. This is because an opaque medium reflects most of the light that falls on it and absorbs the rest, resulting in very little transmitted light.

So, the answer to the first question is Opaque.

Moving on to the second question:

1. Understand the role of a satellite in communication: Satellites are used for various purposes, including communication. In the context of radio signals, satellites can either receive, send, prevent, or reduce radio signals.

2. The question asks what a satellite does in terms of radio signals.

3. Based on this information, we can conclude that a satellite primarily sends radio signals. Satellites are designed to transmit signals from one location on Earth to another, hence sending radio signals serves as their main function.

Therefore, the answer to the second question is Send radio signals.

Lastly, addressing the third question about radioactivity:

1. Radioactivity refers to the emission or release of radiation from unstable atomic nuclei.

2. In terms of understanding Earth's age and its hot interior, one of the key aspects is the decay of radioactive isotopes present within the Earth.

3. Over time, these radioactive isotopes undergo a process called radioactive decay, which involves the release of energy in the form of heat.

4. This heat generated through radioactive decay contributes to the overall temperature of Earth's interior, even after billions of years.

By studying the rates of decay and the isotopic compositions of rocks and minerals, scientists can estimate the age of Earth and deduce that it has a hot interior that results from the long-term accumulation of radioactive decay.

So, radioactivity allows scientists to understand how Earth can be so old and still have a hot interior.