*Question G0B10:
Which of the following is a danger from lead-tin solder?*  

*Correct Answer is  A: Lead can contaminate food if hands are not washed carefully after handling the solder*  

### AI Response: (may contain errors)  

The correct answer to the question about dangers from lead-tin solder is:

**A: Lead can contaminate food if hands are not washed carefully after handling the solder.**

### Explanation of the Correct Answer:
- **Lead Contamination**: Lead is a toxic heavy metal that can cause serious health issues if ingested. When working with lead-tin solder, it is crucial to wash your hands thoroughly after handling it to prevent lead from contaminating food or surfaces. This is especially important for anyone who may eat or prepare food after working with solder.

### Why the Other Choices are Incorrect:
- **B: High voltages can cause lead-tin solder to disintegrate suddenly**: 
  - This statement is misleading. Lead-tin solder does not disintegrate due to high voltages. Instead, it can melt or become damaged if exposed to excessive heat, but high voltage itself does not cause disintegration.

- **C: Tin in the solder can “cold flow,” causing shorts in the circuit**: 
  - While "cold flow" can occur in some materials, it is not a significant concern with lead-tin solder in typical applications. Cold flow refers to the gradual movement of a material under pressure, but it is not a common issue that leads to shorts in circuits made with solder.

- **D: RF energy can convert the lead into a poisonous gas**: 
  - This statement is incorrect. RF energy does not convert lead into a gas. Lead is a solid metal and does not vaporize into a gas under normal RF exposure conditions. The primary concern with lead is its toxicity when ingested or inhaled as dust, not as a gas.

### Summary:
- Always wash hands after handling lead-tin solder to avoid lead contamination.
- Understand that high voltage does not disintegrate solder, and cold flow is not a significant risk with lead-tin solder.
- RF energy does not convert lead into a gas, so this concern is unfounded.

By focusing on safe handling practices and understanding the properties of materials, you can minimize health risks associated with soldering.