Question

understanding atomic structure
use your observations to answer these questions:

1. electrons are negatively charged particles in atoms. based on what you observed, do you think electrons moved from the person to the generator or from the generator to the person? explain your reasoning.

1. each hair strand contains atoms with electrons. why do you think the hair strands stand up?

1. predict what would happen if we used the vandegraaff generator on wet hair versus dry hair. explain using your knowledge of electrons and atoms.

1. predict what would happen to the amount of charge the longer the volunteer touched the vandegraaff. why do you think that is?

Explanation:

To solve these questions, we'll analyze each one using concepts from Physics (a subfield of Natural Science) related to atomic structure, electric charge, and electron movement.

Question 6

Step 1: Recall Charge Nature

Electrons have negative charge. A Van de Graaff generator builds up static charge (usually positive, as it removes electrons).

Step 2: Determine Electron Flow

If the generator is positive, it attracts electrons. So electrons move from the person to the generator (since the person is a conductor, electrons in their body are drawn to the positively charged generator).

Step 1: Charge Distribution on Hair

When a person touches the generator, electrons (or charge) transfer to the person, including their hair. Each hair strand gains the same type of charge (e.g., negative or positive, depending on electron flow).

Step 2: Electrostatic Repulsion

Like charges repel. So each hair strand, with the same charge, repels neighboring strands, causing them to stand up.

Step 1: Wet vs. Dry Hair Conductivity

Dry hair is an insulator (poor electron flow), while wet hair (with water) is a better conductor (water has ions, facilitating electron movement).

Step 2: Predict Charge Transfer

• Dry hair: Charge builds up easily (insulator traps charge), so hair strands stand up more noticeably.
• Wet hair: Charge dissipates faster (conductor allows electrons to flow to/from the environment), so less charge accumulates on hair, and strands may not stand up as much (or at all).

Answer:

Electrons moved from the person to the generator. Reason: A Van de Graaff generator typically becomes positively charged (loses electrons). Electrons (negative) are attracted to the positive generator, so they flow from the person (a conductor with free electrons) to the generator.

Question 7